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** Charlotte's ''Rafale Revive Custom II'' is not just an AceCustom variant piloted by a CharClone. [[https://www.youtube.com/watch?v=5T0-SyZmLqY Thanks to that Pile Bunker attack on Laura,]] it is also an [[VideoGame/SuperRobotWarsCompact2 Alt Eisen expy]].
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** Charlotte's ''Rafale Revive Custom II'' is not just an AceCustom variant piloted by a CharClone.variant. [[https://www.youtube.com/watch?v=5T0-SyZmLqY Thanks to that Pile Bunker attack on Laura,]] it is also an [[VideoGame/SuperRobotWarsCompact2 Alt Eisen expy]].
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* CluelessChickMagnet: Ichika, ''Ichika'', '''''Ichika'''''. He's got a truckload of admirers inside (most of his schoolmates, particularly [[{{Tsundere}} Houki]], [[UpperClassTwit Cecilia]], [[ChineseGirl Rin]], Charlotte and [[SuperSoldier Laura]]) and outside (e.g., Ran Gotanda, his junior-high former neighbour) the IS Academy... and he's none the wiser. Somewhat justified, as being the rare male to pilot the female only PowerArmor of the series, plus the fact that he's the ONLY male student in the entirety of the IS Academy makes him the only available choice... And to many girls, quite a good one.
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* CluelessChickMagnet: Ichika, ''Ichika'', '''''Ichika'''''. He's got a truckload of admirers inside (most of his schoolmates, particularly [[{{Tsundere}} Houki]], [[UpperClassTwit Cecilia]], [[ChineseGirl [[AnimeChineseGirl Rin]], Charlotte and [[SuperSoldier Laura]]) and outside (e.g., Ran Gotanda, his junior-high former neighbour) the IS Academy... and he's none the wiser. Somewhat justified, as being the rare male to pilot the female only PowerArmor of the series, plus the fact that he's the ONLY male student in the entirety of the IS Academy makes him the only available choice... And to many girls, quite a good one.
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[[TwentyMinutesIntoTheFuture Sometime in the future]], a new [[PoweredArmor exoskeleton]] called the Infinite Stratos (IS) system was developed in Japan and quickly demonstrated just how [[CurbstompBattle easily it could take out a variety of conventional military weapons]]. The weapon was soon adopted by several nations... save for one flaw -- [[GirlPowered only women could pilot it]]. This [[SlidingScaleOfGenderInequality shifted the social structure to favoring women over men]], until EveryMan Ichika Orimura becomes the first male to activate an IS and is soon thrust into a new life as a new student at the prestigious -- and previously all-female -- Infinite Stratos Academy.
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[[TwentyMinutesIntoTheFuture Sometime in the future]], a new [[PoweredArmor exoskeleton]] called the Infinite Stratos (IS) system was developed in Japan and quickly demonstrated just how [[CurbstompBattle easily it could take out a variety of conventional military weapons]]. The weapon was soon adopted by several nations... save for one flaw -- [[GirlPowered [[GenderRestrictedAbility only women could pilot it]]. This [[SlidingScaleOfGenderInequality shifted the social structure to favoring women over men]], until EveryMan Ichika Orimura becomes the first male to activate an IS and is soon thrust into a new life as a new student at the prestigious -- and previously all-female -- Infinite Stratos Academy.
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* HotterAndSexier: The series' second manga adaptation, where it seems like every girl has gotten a boob job ([[RunningGag except Rin]], [[ACupAngst who still looks the same]]) and strike poses that accentuate their figures. The mangaka of the second adaptation is [[BleachedUnderpants Yuuki Homura.]] Those that know the artist wouldn't be surprised if Chifuyu got special treatment as he favors well endowed big sisters.
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* HotterAndSexier: The series' second manga adaptation, where it seems like every girl has gotten a boob job ([[RunningGag except Rin]], [[ACupAngst who still looks the same]]) and strike poses that accentuate their figures. The mangaka of the second adaptation is [[BleachedUnderpants Yuuki Homura.]] Homura. Those that know the artist wouldn't be surprised if Chifuyu got special treatment as he favors well endowed big sisters.
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* IntimateLotionApplication: During the BeachEpisode, Cecilia all but demands Ichika to apply suntan oil on her bare back, causing the other girls to get envious at the boldness of her request. Ichika nervously complies but is very uncomfortable doing it, especially since she starts suggestively moaning while he rubs her. [[ClingyJealousGirl Rin gets so jealous]] that she eventually stops Ichika, takes the suntan oil, and finishes rubbing Cecilia herself, but is ''much'' rougher about it. This causes Cecilia to stand up to complain, forgetting she has untied her bikini top and thus giving [[AccidentalPervert Ichika and everyone else]] an eyeful of her chest. Once she notices it, she has a NakedFreakOut that is followed by her [[PervertRevengeMode punching Ichika in the face]] with [[MegatonPunch her IS arm]] (Which [[{{Hammerspace}} materializes out of nowhere]]).
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[[TwentyMinutesIntoTheFuture Sometime in the future]], a new [[PoweredArmor exoskeleton]] called the Infinite Stratos (IS) system was developed in Japan and quickly demonstrated just how [[CurbstompBattle easily it could take out a variety of conventional military weapons]]. The weapon was soon adopted by several nations... save for one flaw -- [[GirlPowered only women could pilot it]]. This [[SlidingScaleOfGenderInequality shifted the social structure to favoring females over males]], until EveryMan Ichika Orimura becomes the first male to activate an IS and is soon thrust into a new life as a new student at the prestigious -- and previously all-female -- Infinite Stratos Academy.
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[[TwentyMinutesIntoTheFuture Sometime in the future]], a new [[PoweredArmor exoskeleton]] called the Infinite Stratos (IS) system was developed in Japan and quickly demonstrated just how [[CurbstompBattle easily it could take out a variety of conventional military weapons]]. The weapon was soon adopted by several nations... save for one flaw -- [[GirlPowered only women could pilot it]]. This [[SlidingScaleOfGenderInequality shifted the social structure to favoring females women over males]], men]], until EveryMan Ichika Orimura becomes the first male to activate an IS and is soon thrust into a new life as a new student at the prestigious -- and previously all-female -- Infinite Stratos Academy.
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* BoobsOfSteel: All IS pilots and students (except for Rin and Laura) are well-endowed to some extent but Houki, Maya and Tatenashi stand out in particular.
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* FunbagAirbag: In episode 9 Rin runs into Orimura-sensei; the latter being quite tall and all… [[BoobsOfSteel well]].
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* FunbagAirbag: In episode 9 Rin runs into Orimura-sensei; the latter being quite tall and all… [[BoobsOfSteel well]].well.
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A fighting game for the PC called ''Infinite Stratos Versus Colors'' was released on December 31, 2014. View the trailer [[https://www.youtube.com/watch?v=YppzMhUrx54 here]].
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A fighting game for the PC called ''Infinite Stratos Versus Colors'' was released on December 31, 2014. View the trailer [[https://www.youtube.com/watch?v=YppzMhUrx54 here]].
here]]. In addition, Houki (both in training and Akatsubaki form), Cecilia, Lingyin, Charlotte and Laura are playable characters in ''VideoGame/SuperHeroineChronicle'' though Laura starts off as a villain. In addition, the girls have [[Anime/{{Symphogear}} Hibiki Tachibana]] [[EvenTheGirlsWantHer as the target of their affections]].
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* ActorAllusion:
** The following instances involving Ichika is this trope in relation to [[Creator/KoukiUchiyama his seiyuu's]] role as the main character of ''Anime/MobileSuitGundamUnicorn'': the predominantly-white motif of his IS (and which name translates as "Type-White") as to the titular mech; his duel against Rin, posing and [[http://i56.tinypic.com/2vxixkj.jpg charging similar to the titular mech]]; and the OutOfClothesExperience scene with Houki in Season 1 Episode 11, which is based on the scene from Episode 3.
** As to Laura, her eyepatch is on the left eye instead of the right and she initially didn't use knives, [[YouWannaGetSued perhaps to avoid]] making her look and sound any more like [[Anime/MagicalGirlLyricalNanoha Cinque]] than she already [[Creator/MarinaInoue does]]. In the second season, her knives start seeing a ''lot'' more use.
*** Meanwhile in the dub, it's apparently changed to resemble [[Anime/RebuildOfEvangelion another]] eyepatch-wearing TykeBomb.
*** The railgun on her IS has traces of this as well since [[Creator/MarinaInoue her seiyuu]] also voiced another character with [[Anime/TengenToppaGurrenLagann a long-barreled, high-output gun as her main weapon...]]
** Also, this is [[Manga/MaidSama not the only time]] [[Creator/MonicaRial Houki's English VA]] played the role of a dark-haired {{Tsundere}} with [[CharlesAtlasSuperpower an insane amount of strength.]]
** The following instances involving Ichika is this trope in relation to [[Creator/KoukiUchiyama his seiyuu's]] role as the main character of ''Anime/MobileSuitGundamUnicorn'': the predominantly-white motif of his IS (and which name translates as "Type-White") as to the titular mech; his duel against Rin, posing and [[http://i56.tinypic.com/2vxixkj.jpg charging similar to the titular mech]]; and the OutOfClothesExperience scene with Houki in Season 1 Episode 11, which is based on the scene from Episode 3.
** As to Laura, her eyepatch is on the left eye instead of the right and she initially didn't use knives, [[YouWannaGetSued perhaps to avoid]] making her look and sound any more like [[Anime/MagicalGirlLyricalNanoha Cinque]] than she already [[Creator/MarinaInoue does]]. In the second season, her knives start seeing a ''lot'' more use.
*** Meanwhile in the dub, it's apparently changed to resemble [[Anime/RebuildOfEvangelion another]] eyepatch-wearing TykeBomb.
*** The railgun on her IS has traces of this as well since [[Creator/MarinaInoue her seiyuu]] also voiced another character with [[Anime/TengenToppaGurrenLagann a long-barreled, high-output gun as her main weapon...]]
** Also, this is [[Manga/MaidSama not the only time]] [[Creator/MonicaRial Houki's English VA]] played the role of a dark-haired {{Tsundere}} with [[CharlesAtlasSuperpower an insane amount of strength.]]
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* TheThingThatGoesDoink: Appears as a background prop of sorts in [[BirthdayEpisode season 2 episode 5]].
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* BareYourMidriff: The male variant of the IS suit, but only in the anime.
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[[quoteright:350:https://static.tvtropes.org/pmwiki/pub/images/infinite_stratos.png]]
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[[TwentyMinutesIntoTheFuture Sometime in the future]], a new [[PoweredArmor exoskeleton]] called the Infinite Stratos (IS) system was developed in Japan and quickly demonstrated just how [[CurbstompBattle easily it could take out a variety of conventional military weapons]]. The weapon was soon adopted by several nations... save for one flaw -- [[GirlPowered only women could pilot it]]. This [[SlidingScaleOfGenderInequality shifted the social structure to favoring females over males]], until EveryMan Ichika Orimura becomes the first male to activate an IS and is soon thrust into a new life as a new student at the prestigious -- and previously all-female -- Infinite Stratos Academy.
However, his school life is filled with many hurdles and interesting characters. His {{Tsundere}} childhood friend Houki Shinonono is one of his classmates, but her sister Tabane is responsible for building the IS and Houki hates her for it. English UpperClassTwit Cecilia Alcott hates weak men and has trouble finding a decent guy. Flat-chested (and [[ACupAngst not too happy about it]]) Chinese GenkiGirl Huang Lingyin is Ichika's second [[ForgottenChildhoodFriend childhood friend]]. From France, there's also Charlotte Dunois, briefly known as another male pilot who [[HoYay tries to be friendly]] and get close to Ichika before her gender is revealed... and she still wants to be friendly. Finally, German SuperSoldier Laura Bodewig idolizes legendary IS pilot Chifuyu Orimura, who happens to be Ichika's older sister, and therefore hates him for ruining her idol's reputation. Oh, and naturally, there's an evil corporation that wants to steal his IS Core.
Ichika's high school life is about to get very interesting...
''Infinite Stratos'' is a series of LightNovels written by Izuru Yumizuru and illustrated by Okiura (from volumes 1 to 7) and later CHOCO (volume 8 and onward), first published in 2009. As of 2018, there are 12 volumes released. The light novels were licensed for a North American release by J-Novel Club in February 2018 with the first volume getting chapter posted online as they're translated before a full ebook release on April 16, 2018. The series [[https://www.animenewsnetwork.com/news/2018-04-25/infinite-stratos-light-novel-series-ends-in-13th-volume/.130803 will conclude]] with its thirteenth volume, with its release date yet to be revealed.
''Infinite Stratos'' was adapted into an anime in January 2011, simulcast with [[http://www.theanimenetwork.com/Anime/Infinite-Stratos/Info The Anime Network]]. There are two manga adaptations of the story: the first by Kenji Akaboshi, covering the entirety of Season 1; and the second a relaunch by Yuuki Homura. Season 2 aired as part of the Fall 2013 anime season. It's also available on Crunchyroll's [[http://www.crunchyroll.com/infinite-stratos website.]] Viewers living in the USA, Canada, Australia, UK, Ireland, and South Africa may watch it legally there. The anime is also licensed for release by Creator/SentaiFilmworks.
Less than 24 hours after season 2's final episode aired in Japan, it was announced that an OVA based on Volume 8 was in production. It was released on November 26, 2014. [[https://www.youtube.com/watch?v=rdJAQM80qUQ Trailer here.]]
A fighting game for the PC called ''Infinite Stratos Versus Colors'' was released on December 31, 2014. View the trailer [[https://www.youtube.com/watch?v=YppzMhUrx54 here]].
Not related to ''Anime/{{Stratos 4}}''. Nor to [[Anime/MobileSuitGundam00 Lockon Stratos]].
'''Warning!''' Both the main page and the character sheet have spoilers for the light novels as well as the anime. Administrivia/YouHaveBeenWarned.
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!!Gen. 4 Infinite Tropes:
[[foldercontrol]]
[[folder:A - M]]
* AbridgedSeries: [[https://www.youtube.com/watch?v=gWC6HLEHgbw One by AnimeRevAbridged]] and [[https://www.youtube.com/watch?v=qG9uuzMcLr0 Infinite MENT]] which follows the style of ''WebVideo/CodeMENT''.
* AcademyOfAdventure: IS Academy, more or less. Doesn't help that it's on an island, and thus is the only major setting in the series.
* AccentAdaptation: Given the very clear nature of where Cecilia, Charlotte and Laura are from, the English dub gives them British, French and German accents.
* TheAce: Tatenashi Sarashiki, the [[SoBeautifulItsACurse beautiful and attractive]] StudentCouncilPresident who's virtually the strongest IS pilot in the entire academy. She is also the head of the family that [[DepartmentOfRedundancyDepartment leads an organization fighting an evil secret organization]], [[ArsonMurderAndJaywalking and has a sister]] [[TheGloriousWarOfSisterlyRivalry who has a massive inferiority complex]]. She can also tame (and in some cases troll) everyone in Ichika's harem, including Ichika himself. The catch? [[spoiler:Even our Celibate Hero thinks that she's just too perfect and virtually unreachable, which makes her the ''only'' female protagonist whom he (unwittingly) hasn't managed to get roped into the harem. Doesn't stop her from forcing herself into it though.]]
* ActionPrologue: The first anime season begins with a mid-air skirmish. In actuality [[spoiler:it is the skirmish versus Silver Gospel in the final episode]].
* AdaptationInducedPlotHole: The anime fails to explain how Ichika knew Cecilia was within firing range against the berserk unmanned IS. The LightNovels explain that he secretly communicated with her to fire on his command after unleashing Yukihira Type-2 by taking advantage of its barrier-nullifying ability. Cecilia, being frustrated to not be able to help out, [[JumpedAtTheCall answers the call]].
* AlmostKiss:
** [[spoiler:At the end of season 1, Ichika and Houki are about to kiss. [[MomentKiller Then]] [[ClingyJealousGirl the rest of the girls]] [[OhCrap show up]].]]
** Another one occurs in the season 2 OVA ''World Purge'', in which the girls discuss kissing Ichika to wake him up after his mind is still trapped in the virtual world. [[spoiler:While they're discussing the topic, Kanzashi just decides to try and kiss him, but she's pulled away just before she's able to.]]
* AlternateCharacterReading: Kanji that roughly translates as "Fallen Nation Corporation" is given the English reading of "Phantom Task". This doubles as a reference to the in-series nickname given to the [[Anime/MobileSuitGundamSEEDDestiny 81st Autonomous Mobile Group]], otherwise known as "Phantom Pain".
* AlwaysInClassOne: Ichika's class is 1-1.
* AmazonBrigade: The Schwarzer Hase (Black Rabbits), the German IS squad that Laura belongs to. As of episode 11, Ichika's harem has crystallized into this.
* AndNowYouMustMarryMe: [[spoiler:After Ichika saves Laura's life, she responds by [[ForcefulKiss sticking her tongue down his throat]], declaring him to be "her wife," and in the next episode, climbing into bed naked with him.]]
* AnimationBump: The IS' are noticeably more fluid than everything else.
* ArtShift: Expect this for the oncoming volumes (and reprints of previous volumes) with CHOCO taking Okiura's reins.
* AttackDrone: Cecilia's IS is armed with four remote controlled drones armed with lasers that she can use to perform all-range attacks on opponents. The unmanned IS "Golem" also counts. The "Silver Gospel" IS was this in the anime (it had a pilot in the novels, though).
* AwLookTheyReallyDoLoveEachOther: Chifuyu may smack Ichika around a bit, and he complains, but she'll do anything to protect him, and he wants to be an IS pilot so he can return the favor.
** Also [[spoiler:Laura]] is far more lovey-dovey towards Ichika than you'd expect.
* AwesomeButImpractical: Byakkushiki's main armament can (in theory) pierce any defense, at the cost of hemorrhaging shield energy. In practice, Ichika is nearly guaranteed to lose once he activates it.
* BackToBackBadasses: Laura and Charlotte briefly in episode 1 of season 2, after they take out some crooks holding up the cafe they were briefly working at.
* BadassAdorable:
** [[spoiler:Charlotte]]. Despite being a very shy and sweet girl, she can hold her own against 3rd generation IS machines with her slightly-inferior 2nd-generation IS.
** Laura post-[[DefrostingIceQueen meltdown]] also counts due to being TheComicallySerious one with NoSocialSkills.
* BadassArmFold: Laura is prone to do this with her IS
* BalancedHarem: Houki and Rin are Ichika's [[PatientChildhoodLoveInterest childhood friends]], Cecilia and Charlotte have their {{Fanservice}} moments with him, and Laura stole his FirstKiss. Therefore, there was really no way to tell who's got the edge. Houki seems to have pulled into the lead after the first OVA, but it still looks like a setup for NoRomanticResolution.
* BareYourMidriff: The male variant of the IS suit, but only in the anime.
* BarehandedBladeBlock: Around the middle of the first episode when Houki attacks Ichika
* BattleHarem: As his co-homeroom teacher Maya once stated, with his force of six representative pilots, he has more than "enough to start a war."
* BeachEpisode: Episode 9 takes place at a resort for a beach study session.
* BedmateReveal:
** In Episode 9 of season 1, [[spoiler:Ichika wakes up and finds Laura naked in bed with him.]]
** She does it again in episode 1 of season 2, although this time she's wearing a school swimsuit.
** In a slight variation of this trope, Tatenashi does this to Ichika as well in the ''World Purge'' OVA. He accidentally sees her topless after waking up in the nurse's office, hides under the sheet, and innocently asks if she's feeling better after suffering a gunshot wound. [[spoiler:Instead of getting mad at him though, she jumps into his bed, demanding he do lewd things with her too after hearing about what happened to the other girls in the virtual world.]]
* BerserkButton: Lingyin doesn't like being called flat-chested.
* {{BFG}}: Tatenashi uses one in episode 12 of season 2. It's so large relative to her that she has to fire it from the ground.
* {{Bifauxnen}}: Charles's real name is Charlotte, forced into drag so France could gather Ichika's IS data. He finds out pretty quick and helps her hide it due to her situation.
** Makes a return in Season 2 Episode 1, when [[spoiler:Charlotte is hired as a waitress...yet the restaurant still has her wear a butler's uniform. Apparently she looks better in that outfit than even some ''guys'' do.]]
* BirthdayEpisode: Episodes 5 of season 2, which celebrates Ichika's birthday.
** Season 1, Episode 11 took place on the 7th of July, Houki's birthday. Unlike most examples, her birthday is... not a happy one (until the end, when Ichika gives her a new ribbon and shows that he remembered it was her birthday).
* BlackBox: {{Invoked|Trope}} in reference to the IS Cores.
* BlandNameProduct:
** Episode 3 has Pocari Sweat spelled as "Pokari Sweat" however it is superimposed by Rin's hands.
** Averted in the first season OVA as Cecilia is obviously holding a pair of bottles of Tabasco sauce while cooking. Or [[LethalChef trying]] to cook.
** Cecilia wears "L'Ireal" perfume in the novels, an obvious stand-in for L'Oreal.
** "Sugar and Honey" chapter 9 has Laura holding an "[=IPid=]" tablet.
* BoobsOfSteel: All IS pilots and students (except for Rin and Laura) are well-endowed to some extent but Houki, Maya and Tatenashi stand out in particular.
* BreatherEpisode:
** Episodes 5 and 9 in the first season, which are sandwiched between episodes with intense action and drama scenes.
** Episode 5 in season 2, following the episode where Ichika was in a fight for his life. [[spoiler:Subverted at the end however, when Madoka shows up, and we hear a gunshot as episode ends.]]
** Episode 10, season 2. Following a brutal fight in which several of the students were seriously injured, this episode focuses on Cecilia largely trying to be a less LethalChef, but accidentally sickening the other girls in the process. And even during a more serious dramatic moment at the end with Tabane is subverted, [[spoiler:when she delivers a CurbStompBattle to three of the Phantom Task members, including one with a gun, and another in an IS suit, utilizing nothing more than a few kicks, a butter knife, and a fork.]]
* BridalCarry: Ichika does this to help Houki getting in her training IS, much to the latter's delight.
** [[spoiler:Ichika does it to her again at the end of season 1 to get both of them away from the rest of his (furious and jealous) harem.]]
** [[spoiler:In novels, he does it quite frequently, about 3 times to Laura and once to Kanzashi]]
* BrotherSisterIncest: Some of the girls worry that Ichika and Chifuyu might have this kind of relationship (as if they needed ''another'' romantic rival), especially after eavesdropping on a suggestive-sounding massage though it [[SubvertedTrope turns out to be nothing]]. He also looks after the house and Chifuyu in the same manner as some might expect of a wife, much to the other girls' dissatisfaction.
** In Vol 4, chapter 4 (and the OVA), it explains that Chifuyu is bothered by the fact that the girls had silently declared her as the ''strongest rival'' despite that not being her intention at all. [[spoiler:But considering her confession to Maya, Maya concluded that Chifuyu is actually [[UnresolvedSexualTension indecisive/ confused about her own feelings toward Ichika]]. [[FanFicFuel Now we can freely decide that the the ship should]] [[BrotherSisterIncest sail]] or [[ShipSinking sink]]...]].
* [[BunnyEarsLawyer Bunny Ears Scientist]]: Tabane Shinonono (complete with actual bunny ears). She may act like a CloudCuckooLander, but she ''is'' the creator of the IS machines.
* CannotSpitItOut: Played straight for most of the series with the exception of [[spoiler:Laura post-[[DefrostingIceQueen defrost]]]], but averted with at least two girls who actually have a shot by the end of the series. In episode 8, [[spoiler:Charlotte]] gives Ichika a [[FuroScene naked hug in the bath]] and declares she wants to be with him. At the end of the same episode, [[spoiler:Laura]] sticks her tongue down his throat and [[SugarWiki/FunnyMoments declares him to be her wife]].
** Houki tried to avert this trope ''thrice'': at the end of episode 12, she [[SkinshipGrope puts Ichika's hand on her chest, right over her cleavage]], and flat-out asks "You ''do'' know I'm a girl, right?"; in the second part of the OVA, she confesses to him but he gets distracted by the fireworks. What's worse, the explosion from the fireworks muted out her confession. Then in the second season's 7th episode, as Ichika was carrying her home from their photo shoot, she mumbled out a confession to him, but since she was so tired that she fell asleep after saying it, Ichika didn't think much of it. In the novel version of that scene, she was very drunk and slurring her words, so Ichika didn't understand her.
* CastFromHitPoints: Ichika's special attack drains his own meager shields in order to launch a devastating attack that can theoretically 1-shot his opponent. That is, if his shields aren't worn down before he can get close enough to use it, or if the target doesn't simply dodge the attack first.
* TheCastShowOff: The ending theme song, ''Super Stream'', is sung by Ichika's harem girls.
** Episode 1: [[Creator/YokoHikasa Houki]].
** Episode 2: Add [[Creator/{{Yukana}} Cecilia]].
** Episode 4: Add Ling[[Creator/AsamiShimoda yin]].
** Episode 6: Add [[spoiler:[[Creator/KanaHanazawa Charlotte]].]]
** Episode 8: Add [[Creator/MarinaInoue Laura]].
** The second season ending song ''Beautiful Sky'' is done the same way. And as of Episode 9 and 12, add [[spoiler:[[Creator/SuzukoMimori Kanzashi]] and [[Creator/ChiwaSaito Tatenashi]], respectively.]]
* CatchAFallingStar: After Kanzashi's IS Suit blows out a thruster and falls from the sky, Ichika immediately summons his IS and makes a diving save, probably saving her life. [[spoiler:It's about this point where Kanzashi falls deeply in love with him.]]
* ChekhovsGun: Charlotte unlocking the permission for usage of the Rafale Revive's rifle proved to be ''very useful'' when Ichika uses it against Laura in their match.
* ClassRepresentative: Ichika and Cecilia [[WizardDuel fought for the position]] with their [=ISs=]. Cecilia won but handed over the position to the former. Also, Rin became her class's representative after transferring in.
* ClingyJealousGirl: Practically every girl at this point, with Houki at lead position. Back off, bitches. Ichika's ''my'' training partner.
** [[spoiler:Charlotte]] is an exception. As is Laura, oddly enough. You'd think a ProudWarriorRaceGuy would be more violent. Not really. Though Laura's possessive side starts coming out more frequently in the second season.
** And it seems even [[spoiler:[[HotForStudent Yamada-sensei]]]] herself isn't immune to Ichika's charm, judging from her reaction to discovering [[spoiler:Ichika and Charlotte]] together in a fitting room.
** And at the end of the anime, Ichika is caught in a compromising position with [[spoiler:Houki]], sending the rest of his harem into a real jealous rage enough to show up in their IS Suits ready to kick his ass. [[spoiler:Even the sweet and friendly Char is ROYALLY pissed.]]
** All of them are upset with him when he invites them to an outing at a water park in episode 1 of season 2, thinking he only invited them. Then they find out he invited all of them... Laura was the only one who knew from the start that he was going to invite all of them since she was the one who handed him the flyer for the pool in the first place and he was ThinkingOutLoud. And of course, naturally he was [[ObliviousToLove oblivious]] to her sudden sour mood.
*** The second season OVA (which was really just extra footage from the first episode that was cut due to time constraints) shows that the jealousy more or less evaporated once everyone got to the water park, since they were having too much fun there.
* ClothingDamage: Houki's Cinderella dress suffers a little bit in episodes 3 and 4 of season 2.
* CluelessChickMagnet: Ichika, ''Ichika'', '''''Ichika'''''. He's got a truckload of admirers inside (most of his schoolmates, particularly [[{{Tsundere}} Houki]], [[UpperClassTwit Cecilia]], [[ChineseGirl Rin]], Charlotte and [[SuperSoldier Laura]]) and outside (e.g., Ran Gotanda, his junior-high former neighbour) the IS Academy... and he's none the wiser. Somewhat justified, as being the rare male to pilot the female only PowerArmor of the series, plus the fact that he's the ONLY male student in the entirety of the IS Academy makes him the only available choice... And to many girls, quite a good one.
** [[LampshadeHanging Lampshaded]] quite succinctly by Charlotte in the latter half of episode 8:
---> '''Ichika''': ''*On the floor after getting beat up for saying something insensitive again.*''\\
'''Charles''': Sometimes I think you're doing it on purpose.
** Though he get a ''little'' better when some of them confess.
** In the novels he also has Tatenashi's little sister Kanzashi.
** In episode 5 of season 2, when asked which of the girls' performances he preferred the most, he took only a moment to choose Chifuyu's dressing up like a maid and serving him a bite of a parfait. None of [[ClingyJealousGirl the other girls]] take this very well, and even Chifuyu gets flustered by his response.
* ColorCodedCharacters: All of the girls have different colored hair and hairstyles, and all of their IS suits have different colors.
* ContinuityNod: Season 2 Episode 10 has Laura still wearing the adorable cat-pajamas Charlotte bought her in Season 2 Episode 1.
* ContinuityReboot: The anime's second season seemed to be it with [[https://www.youtube.com/watch?v=uipILwmXqgo the first full preview having the word REBOOT]] in it. Except [[NeverTrustATrailer it wasn't.]]
** The second manga adaptation, however, is a reboot. With [[WorldOfBuxom bigger breasts everywhere.]]
* CornerOfWoe: In episode 7 of season 2, [[ClingyJealousGirl Laura attacks]] Ichika with her IS bladed weapon after he says he already has a partner in mind for the upcoming tournament. [[RetiredBadass Chifuyu]] intercepts the attack, and throws her across the room. When Laura complains that her matter with Ichika is strictly between a ''husband and wife'', Chifuyu counters by saying that she would never accept a sister-in-law that acts like that. The statement hits Laura pretty hard, and she quietly sits down on the floor with a gloomy look, muttering to herself.
* CovertPervert: Rin, Cecilia, [[spoiler:Charlotte]], and Laura are shown to be this [[spoiler:in the illusions they have due to the World Purge.]]
* CreditsRunningSequence: The ending uses this as well as EvolvingCredits as [[DebutQueue each person is introduced]] it adds a new person into the ending.
* CripplingOverspecialization: Several examples:
** Ichika's IS is a close-ranged fighter, so in a ranged fight he has to dodge or absorb shots thrown at him until he can get close enough. Unless another IS user allows him to use their ranged weapons. Averted with Rin, who has a weapon that has some medium range capabilities.
** Laura's A.I.C. (Active Inertial Canceler) seems to nullify any attack thrown at her, but she has to stay focused on the attacker for it to work. So if someone else shoots her from behind...
** Cecilia's IS is designed solely for long ranged combat (eg. powerful but slow-firing long beam rifle), so if an attacker can close the distance before she can take them out, she usually seems screwed. Chifuyu also comments in one episode that she's also designed to take on multiple opponents, but in the anime at least, she only ever fights against one opponent at a time.
* CurbStompBattle: Laura easily defeats both Cecilia and Rin at the same time in her debut battle.
** Yamada-sensei does the same to those same two girls during a training fight, with a [[SoLastSeason Second-Generation]], ''Mass-production'' IS suit.
** An unknown IS named White Knight ([[spoiler:*:*cough*Chifuyu*cough*]]) took out 2,341 hacked missiles shot towards Japan 10 years ago. After the missile attack was repelled, countries from all over the world send a task force to capture or destroy White Knight; it destroys every single thing sent after it. At the end of the battle, 207 fighter jets, 7 cruisers, 5 aircraft carriers and 8 satellites were destroyed - the kicker - no loss of human life. The White Knight is a ''first generation'' IS. Heavily implied to be [[spoiler:Tabane's work, trying to convince the world that the Infinite Stratos far outguns any weapon or weapon platform then available. It works unbelievably well.]]
** The fight between Tatenashi and Autumn in episode 4 of season 2. Any setbacks the former faces was largely just her playing around with the latter, but she has the upper hand, forcing Autumn to attempt a retreat.
*** [[spoiler:Tatenashi is then on the receiving end of one in episode 9 of season 2, when she realizes that her usual attacks don't seem to be affecting the unmanned IS suits attacking the school.]]
* CustomUniform: Is understandable in Ichika's case but there's not really any excuse for the rest of the main characters.
* CutShort: The second manga adaptation by Yuuki Homura was cancelled after 8 volumes, and this was after he had taken a year off after publishing Volume 6. Some comments on his on his Twitter indicate that [[https://old.reddit.com/r/InfiniteStratos/comments/fexl78/from_the_author_of_the_current_manga_can_someone/ the manga's ending was rushed but hopefully some people would find it satisfactory.]]
* CuteLittleFangs: Lingyin's got these.
* DangerousForbiddenTechnique: The Byakku Shiki's signature attack is extremely powerful, but it comes at the cost of draining the suit's own shield energy.
** There's also the Valkyrie Trace System where [[spoiler:the IS will absorb you due to overwhelming emotions.]]
* DatePeepers: Cecilia, Lingyin and Laura tailing Ichika and [[spoiler:Charlotte]] in Episode 9. Then Laura tries to walk up and just ''ask'' what's going on, but Cecilia and Rin stop her.
* DeathByAdaptation: In the ''World Purge'' OVA, it's strongly implied that [[spoiler:the American IS pilot is killed by Maya after she opens fire with her modded-out ''Rafael'']]. However, in the novel, there was another scene that happened after the OVA's ending that wasn't animated where [[spoiler:it's revealed the pilot survived, and Chifuyu releases her and tells her to go back to her base since it isn't worth the political headache to keep her as a hostage.]]
* DefeatMeansFriendship:
** Laura is initially very hostile to everyone, particularly Ichika. But after he beats her, and saves her post-meltdown, she softens up. Sort of.
** Inverted with Cecilia, who technically won her first fight with Ichika, but grew to respect him anyway.
* DisproportionateRetribution: Poor Ichika. Looked at Cecilia's breasts accidentally? [[MegaTonPunch Get punched with an IS arm.]] Take a bath with a guy [[spoiler:who turned out to be a girl?]] Rin will go {{Yandere}} on you! Caught in an arm grapple by a naked girl who snuck into your bed? "Divine Punishment!" And later, get caught trying to kiss Houki? All the girls will now hunt you down like the dog you are. No wonder he has to act like a ChasteHero most of the time, because no matter who he chooses, he loses. He lampshades this reason of his in the manga adaptation.
* DistractedByTheSexy: All the freaking time - even his own sister invokes it. Although he acts more embarrassed by it more than anything. Taken up to eleven in episode 5 of season 2, where all of the girls are wearing {{Sexy Whatever Outfit}}s, [[spoiler:(Including Chifuyu in a maid outfit)]], and are trying to appeal themselves to him.
* DistressedDude: Ichika was kidnapped because he was the brother to the world's best IS pilot at the time, Chifuyu. And this trope is probably the reason why he was forcibly enrolled in the IS Academy, since not only is he Chifuyu's younger brother, but he's also the world's only man that can activate/pilot the IS suits. Which no doubt means every country in the world would love to have their hands on him if given the opportunity again, to learn how he managed to activate it.
** A potential [[DistressedDamsel inverted example]] with Houki. Since her sister Tabane was the creator of the IS system, the Japanese government moved her and her family around a lot to avoid anyone attempting to kidnap Houki in an attempt to force demands on Tabane. Of course, this caused a lot of strife with Houki towards her sister, as it caused her to be separated from Ichika.
* DoesThisRemindYouOfAnything:
** When Ichika's harem eavesdropping on him and Chifuyu in episode 10, accompanied by {{Sexophone}}, no less. [[spoiler:Ichika's just giving her a massage.]]
** In preparation to deal with the rogue IS, Ichika needs [[spoiler:Houki's IS' speed]] and Houki says this.
---> '''Houki''': "Although my pride would naturally prevent any man from mounting atop a woman. I'll make a special exception this time."
** In episode 10 of season 2, Ichika asks some rather suggestive sounding things to Ceciilia, while the camera pans around in a bedroom, one of which is his jacket lying on a bed. [[spoiler:Then it turns out he's just teaching her how to make rice balls.]]
* DoubleStandardAbuseFemaleOnMale: With a [[BattleHarem harem]] full of {{Clingy Jealous Girl}}s, abuse is heaped on Ichika virtually once an episode. It can get hard to watch the show at times if this trope comes to mind. However, with such a [[ObliviousToLove blockhead of a protagonist]] with picking up on matters of the heart, its also not hard to believe he deserves at least some of it.
* DramaticPause: [[spoiler:When Laura steals Ichika's FirstKiss.]]
* [[DudeShesLikeInAComa Dudette, He's Like, In A Coma!]]: [[spoiler:After the battle with the unmanned IS, Rin tries to kiss a sleeping Ichika in the infirmary, but then he wakes up, and she quickly jerks back.]]
** [[spoiler:And ''again'' just right after a half-naked Charlotte knocks Ichika out during [[AccidentalPervert a little misunderstanding between them]]. This time, it's just the forehead, though.]]
** And in the beginning of Episode 9, [[spoiler:Ichika wakes up to find that at some point during the night, Laura snuck into his room to sleep with him in his bed... ''naked''.]]
*** [[spoiler:In Laura's defense, [[NoSocialSkills her lack of social skills]], and the fact that she believes them to be "married", means that she doesn't understand the impropriety of her actions.]]
* DullEyesOfUnhappiness: Executed by both Cecilia and Rin upon [[spoiler:seeing Ichika and Charlotte holding hands as they go shopping for swimsuits]].
* {{Eagleland}}: Apparently America is to blame for the Japanese goverment handling the IS academy, President Obama much more specifically in the manga (In the relaunch manga, it was Hilary Clinton who took his place.)
** Also note, the ''Silver Gospel'' crisis is partly their fault as well [[spoiler:considering ''[[GameBreaker Silver Gospel]]'' was developed outside the IS Academy in secret, [[ScrewThisIndexIHaveTropes a clear violation of the Alaska Treaty]]. Volume 6 added icing on the cake by showing they did it again with the (much less gamebreaker) ''Fang Quake'', but still.]] Note that according to the treaty, while you are allowed to build IS units outside the academy, all testing of {{Super Prototype}}s and their gimmicks have to be inside the academy.... or else the unit/system will become a public domain design.
** The World Purge incident shows us some Flavor 2 actions by America. When [[spoiler:the IS Academy is hacked and its power sources sabotaged, America sends in the ''Fang Quake'' model & a team of special forces to raid the academy in order to steal the unregistered IS cores that Chifuyu & Maya recovered from the unmanned drone attacks. While the U.S. was not behind the hacking, the fact that they took advantage of the incident so quickly (and knew about the unregistered cores) proves that America has the academy on 24/7 surveillance (and most likely, so do many other countries).]]
* EmpathicWeapon: The IS system is adaptive and semi-"aware" of its pilot, constantly adjusting to better suit them complete with a synchronization rate and controlled by thought as much as motion. Especially so the personal IS units, which perform like generic trainer units until they've seen some use and adapt. Several suits also have powerful functions that can be triggered by the pilot's mental state. Probably the reason why self-piloting drone IS systems have long been considered impossible, lacking a pilot's guiding will.
* EroticDream: Cecilia has a pretty intense dream of Ichika about to take her virginity at the start of Volume 12... until she falls off the bed and smacks her head on the floor. Upon turning on the lights, her roommate Kisaragi Kisara gets real irritated, and she has also figured out exactly what kind of dream Cecilia was having and complains that her moaning is keeping her up at night.
* EvenTheGirlsWantHer: Nearly all the girls in Ichika's class have a crush on his sister Chifuyu.
** [[spoiler:Charlotte in a butler's outfit. Holy crap.]]
* EveryoneCanSeeIt: The girls of the harem frequently point out how they view [[IncestSubtext Chifuyu]] as their greatest rival for Ichika. The way they behave around each other normally is a big bone of contention for the rest of the harem. During the OVA, they even take notice as how the two behaved more like a married couple than siblings.
* EvolvingCredits: This trope seems to be used as quite an art form in the anime adaptation:
** During the first eight episodes of Season 1, when a girl gets added to Ichika's harem, they get added to the end credits and they join in the song.
** As the girls are added, only the most recent one is running in step with Ichika, with the others following behind them at a different pace, but beginning with episode 10 up to the second season, [[spoiler:everyone is running together in perfect sync.]]
** Houki's ribbon becomes white with a red line, instead of the usual green with black [[spoiler:during the end credits of Episode 12.]][[note]] The said ribbon was the same one Ichika gave for her birthday on the very same episode.[[/note]]
** This was also applied in the Opening sequence of Season 1, where Charlotte is seen wearing the female IS uniform after the [[UnsettlingGenderReveal Bridget Drop]].
** The ending sequence in Season 2 takes this somewhat up to eleven:
*** For the first 5 episodes, a different girl is displayed in the background with all the main characters running in unison. Additionally, another girl is added to the picture taken at the end with Ichika and his sister.
*** In episode 5, the girls are wearing the suits they had on during that episode instead of their school uniform when running; while in the Long Vacation OVA, everyone is wearing the swimsuits they used.
*** For episode 7, [[spoiler:Only Ichika and Houki]] have different outfits compared to the others [[spoiler:because of the photo shoot they participated in]].
*** At the end of episode 9, [[spoiler:Kanzashi is added to the harem. She is seen running right behind him, and her picture is used in the background. Additionally, she is in the picture taken at the end along with the other girls.]]
*** As of episode 12, [[spoiler:Tatenashi is added into the sequence, running in sync with the cast behind Kanzashi. Also, each character is shown in the background wearing civilian attire.]]
*** The ''World Purge'' OVA's ending credits have [[spoiler:each girl wearing the clothes they had on in their fantasy sequences, save for the Sarashiki Sisters[[labelnote:Note]]Kanzashi was on MissionControl duty that time, while Tatenashi held off the invading special forces[[/labelnote]]. For added fanservice bonus, Laura was wearing the NakedApron she wore at that time, and is holding it down with her left hand, thus forcing her to do a GirlyRun.]]
* EyePoke: Ichika suffers one from Charlotte in the OVA for season 2.
* EyepatchOfPower: Laura and the [[AmazonBrigade Schwarzer Hase]].
* FaceFault: Seems to happen with a fair amount of frequency.
* FallingIntoTheCockpit: Or more like walking into it. How did Ichika discover he's the first male IS pilot? He accidentally wandered into the IS Academy's exam room while looking for the exam room for the school he was going into (which happened to be adjacent to the Academy, and had a similarly pronounced name). An IS happened to be in said room.
** Chifuyu theorizes in the anime that Tabane may have engineered the whole thing. [[spoiler:Tabane denies it, and says she has no idea how he's doing it. While the exam room's IS unit was indeed rigged ahead of time to generate a response, a random, non-rigged trainer unit that was brought in for Ichika to actually use for his exam also responded, casting aside any notion that it was a mere co-incidence.]]
* {{Fanservice}}: Bits of it here and there can be seen in the beginning, and pretty full-fledge starting with episode 3.
** Heck, the entire premise was made for this. Making the IS only pilotable by women was ''not'' from the progressiveness of the writers' hearts.
** Laura Bodewig berating Ichika's ground fighting technique, while naked and holding his arm between her legs. (Nice, lengthy scene.)
** In the middle of Season 2 Episode 2, we are treated to Charlotte doing stretching exercises in her skintight IS outfit. Of course, the scene centers on [[MaleGaze her rear.]]
** Season 2 Episode 5. All of it. (The ''"why"'' can be read on the Crowning Moment of Funny page.)
** Episode 12 of Season 2 closes with an HotSpringsEpisode, full of CensorSteam (no doubt to encite the audience to buy the uncensored Blu Ray version).
** The OVA for season 2, ''World Purge Hen'', is chock full of this, with every girl getting a WishFulfillment scene with Ichika while trapped in the IS core system.
* FilmingForEasyDub: The ending of Season 2 Episode 10. What should have been a Crowning Moment of Awesome for Tabane became this because the camera kept going for close-ups on the cafe's sign outside, M's face, or other random objects in the restaurant, with Tabane speaking over these shots. Did the studio run out of cash to animate [[spoiler:Tabane disassembling the Silent Zephyrus to [[OffscreenMomentOfAwesome pieces with just her hands]]?]] It's completely averted in the DVD/Blu-ray version.
* ForcefulKiss: [[spoiler:Laura took Ichika's first kiss by shoving her tongue down his throat. While still wearing her IS armor.]]
* FreudianExcuse: Laura is a genetically engineered SuperSoldier who had undergone intense military training since birth. Naturally, this means that she has [[NoSocialSkills zero social skills]], which is why she initially comes off as a huge {{Jerkass}}.
** Cecilia's views of men as weak stem from witnessing her socially weak and inept father.
* FunbagAirbag: In episode 9 Rin runs into Orimura-sensei; the latter being quite tall and all… [[BoobsOfSteel well]].
* GeckoEnding: Even though the second season's last three episodes are adapted from volume 7, they include anime original content. The only scenes that were in the novels were [[spoiler:the first 5 minutes of & the end of episode 10 when Phantom Task tried to pressure Tabane into working for them, and even that scene was altered from the novel because of the lack of Chloe Chronicle. [[MyFriendsAndZoidberg As well as the scene in episode 11 where Laura has difficulty eating cute rabbit-shaped sweets]], but that scene occurred much earlier in the novels.]] Volumes 9 & 10, which were released 1 and 2 years after the anime's end, later cover some of the events of these episodes, but not all. The author himself even admitted in Volume 10's afterword that he treats the two as separate continuities, as "the things that happened in the anime happened in the anime, the things that happened in the books happened in the books."
* GenderReveal: [[spoiler:Ichika discovers Charlotte is a girl when he [[ShowerOfAwkward walks on her in the shower]]. She has a NakedFreakOut and tries [[HandOrObjectUnderwear cover herself with her hands]] while he's [[DeerInTheHeadlights frozen with shock]].]]
* GetAHoldOfYourselfMan:
** Houki gives one to Ichika for trying to charge recklessly towards Laura's VT-enabled IS.
** Rin gives Houki a good slap [[HeroicBSOD after she blames herself for Ichika getting hurt]].
* GirlyRun: In the ending theme, Cecilia and [[spoiler:Charlotte]] seem to run like this.
** In Season 2, when [[spoiler:Kanzashi]] joins the harem, she runs like that too.
* GossipEvolution: What originally was "Ichika agreeing to date Houki if she becomes tourney champion" one evening becomes "Ichika agreeing to date anyone who becomes tourney champion" the next morning. All thanks to [[ThoseTwoGuys three certain girls]], of course.
* GratuitousForeignLanguage: The original sub only has a few minor instances of GratuitousEnglish (such as the name Infinite Stratos itself). The dub, however, gives Charlotte and Laura thick French and German accents, respectively, and they pepper their speech with [[GratuitousFrench French]] and [[GratuitousGerman German]].
** GratuitousEnglish: Chifuyu in the season 2 episode previews uses this when announcing the title of the next episode. It's actually pretty hilarious considering how seriously she says it each time. Then again, Creator/MegumiToyoguchi is no stranger to [[Manga/BlackLagoon Engrish]]...
* GunsVsSwords: Cecilia vs. Ichika. Cecilia wins because Ichika's sword drains his shield energy with every attack and his shields ran out seconds before he won.
* {{Gunslinger}}: Cecilia and Charlotte.
* HappyEndingMassage:
** Cecilia gets massaged by Ichika twice. The first one made her orgasm with him none the wiser.
** Tatenashi in season 2 has heard about these and demands that Ichika give her one too in episode 3. However she asks him while he's using the bathroom, and it turns into SeriousBusiness when she uses her IS weapon to break the door down after he attempts to barricade himself in there. He finally relents and gives her one much to her delight.
* HelmetsAreHardlyHeroic: The members of Phantom Task who have their own IS Suits (Madoka, Autumn, Squall) have full-face helmets when piloting their suits. The protagonists... don't.
* HeroTrackingFailure:
** Many shots fired at the main characters by their opponents, though flashy, often miss.
** Tatenashi manages to evade gunfire without her IS suit in the season 2 OVA. Unfortunately her PlotArmor wears off shortly afterwards and she's hit by one bullet.
* HeroicBSOD: Houki goes through a brief one in episode 11 after Ichika loses consciousness while protecting her from one of Silvario Gospel's attacks.
* HighPressureBlood:
** [[spoiler:Happens to Tatenashi in episode 9 of season 2, after she shields her sister Kanzashi from an attack by an unmanned IS suit.]]
** Tatenashi suffers one in the ''World Purge'' OVA after realizing that the hacker was actually a third party independent of the Americans attempting to steal the school's IS core. [[spoiler:She is then shot by one of the soldiers she knocked down earlier, who manages to fire a pistol at her. Quite a bit of blood then spurts out.]]
* HighSpeedMissileDodge: Pulled off and [[SubvertedTrope subverted]]. Ichika still takes a hit from Cecilia's missiles... and survives.
* HistoricalInJoke: Charlotte and Laura's relationship is similar to the relationship of France and Germany, who at first were at odds with each other, until they became friends through the Franco-German Friendship after UsefulNotes/WorldWarII.
* HotSpringsEpisode: Ichika and Charles, er, Charlotte, get one together in episode 8. Nobody thinks much of it at the time, until Charlotte [[TheReveal comes out of her shell]] the next day, causing a big ruckus.
* HotTeacher: Chifuyu. Oh yes. Her own brother regularly compares her figure as being better than most models... Much to her chagrin.
* HotterAndSexier: The series' second manga adaptation, where it seems like every girl has gotten a boob job ([[RunningGag except Rin]], [[ACupAngst who still looks the same]]) and strike poses that accentuate their figures. The mangaka of the second adaptation is [[BleachedUnderpants Yuuki Homura.]] Those that know the artist wouldn't be surprised if Chifuyu got special treatment as he favors well endowed big sisters.
** The very ''first page'' of the reboot manga is Houki [[ShowerScene taking a shower]], with only CensorSteam covering up her breasts.
* HowWeGotHere: The first part of episode one depicts a battle between Ichika and his team versus the unknown IS machine. The rest of the season depicts the events leading to that scene. The same is true for the second season.
* ImpaledWithExtremePrejudice: Tatenashi in episode 4 of season 2. But it turns out to have been a fake that she manipulated using nanobots. [[spoiler:Played straight in episode 9 of season 2, when she shields her sister from an attack with her own body. She barely survives it and is taken to the hospital after the attack by the unmanned IS suits is stopped.]]
* ImprobablyFemaleCast: Although justified In-universe. The IS system can only be used by women normally, but Ichika is somehow able to activate it as well. Even Tabane, the IS suit creator, is unsure of how he's able to do it. As a result, Chifuyu transfers him to the all-girls school to learn IS combat, partly so he can learn to use his IS suit better, and largely to keep an eye on him, lest some unscrupulous country or organization gets their hand on him again.
* IncestSubtext: Charlotte accuses Ichika of this when she sees his reaction to Chifuyu in a skimpy swimsuit, but [[HotTeacher who could blame him anyway]]? The catch, which wasn't show in the anime, is that ''Chifuyu'' asked ''him'' which one he'd prefer between a white sporty one and the black one that she ended up getting. He inadvertently picks it by glancing at it first, which she took as his first choice.
** Picking out her wardrobe is nothing new - he does it all the time for her and she wears his choices with no complaint. She'll even go a bit out of her way to grab/wear the ones that ''he'' likes more.
** Given what they overheard coming from their shared room in Episode 10...
** Also from Episode 10, the conversation that Chifuyu and the 5 girls have heavily implies that she has challenged them to "try and get to my level". And she doesn't mean in IS piloting skill. In the OVA, there was the little bit of her coming home to the house and Ichika greeting her like a housewife. She notes this to Yamada, saying; "On that field trip, I told those five girls I wouldn't let them have Ichika. I didn't think much of it or put any deep meaning into it, but it seems the girls think that I'm a rival now."
** Then there's Ichika's birthday, in which every member of the harem decides to cosplay for him. Chifuyu ends up being the main event, dressing as a maid for him and actual spoon feeds him [[note]]Again, something the rest of the harem have repeatedly tried to do with no success.[[/note]]. When Ichika is asked who's performance was his favorite, he chooses Chifuyu without a second thought.
* InformedAbility: In the anime, it's mentioned that Byakku Shiki is quite possibly the most powerful IS in the school, if not the world. However, Ichika so far has not been able to defeat an enemy (or at least has extreme trouble in doing so) in a straight up one-on-one fight.
** The Byakku Shiki is considered powerful due to it's ''only'' weapon: a sword that '''one-hit-KO's opponents'''. This, coupled together with its insane maneuverability and speed, makes it extremely formidable. The problem comes from the fact that said assets also rapidly drain the shield energy of the IS. Basically, it has a lot of raw power and speed, but very little endurance.
** There's also the matter of the pilot, who is still very much behind everyone else in both formal and informal training (being that no men before him piloted an IS, that's justified). This discrepancy shows very well in Ichika's first battle with Cecilia; he's completely untrained, flying an IS for the second time in his life - a close-range type he's wholly unfamiliar with. She's practically a professional considering her age, and fights in a long-range model. He lasts over thirty minutes, figures out a tactic that could potentially beat his opponent, and ''then'' his IS enters First Shift - i.e., he kept up with her while overwhelmingly outgunned, outprepared and outmatched in every way on the equivalent of the lowest power setting Byakushiki has. And then comes within a hair's breadth of winning. No wonder Cecilia breaks down after this and falls for him; had they been on an even level in mere training, [[CurbStompBattle she wouldn't have lasted five minutes]] against him.
* InformedAttribute: The novels remind the reader over and over '' and over'' again that ever since the introduction of the ''Infinite Stratos'' suits, society has changed so that women are the dominant gender in everyday life, so much so that if a man on the street were to suddenly be ordered by a woman to do some ridiculous task (like suddenly shining her shoes for no reason), it wouldn't be unusual. But we never see any examples of this kind of thing happening. The anime & manga adaptations don't even bring up this issue. The majority of the novels' contents are written from Ichika's point of view, which means this could be UnreliableNarrator, but there are a few times when even the third-person narration brings up this point, such as when three bank robbers attacked the maid cafe in Volume 4 Chapter 2 [[labelnote:*]]The corresponding anime episode is Season 2 Episode 1[[/labelnote]] in which the narration describes these men as being either extremely brave or extremely foolish to pull this kind of stunt in a world dominated by women.
** Volume 7 finally shows some evidence of this when Ichika is denied entrance to a fancy restaurant because he lacks a tuxedo. Ichika has to buy a tuxedo from a shop in the same building, no other options. While there is a similar dress code for females, they are at least allowed the opportunity to ''rent'' a dress.
* InstantArmor: Most IS users can summon part or all of their at any given moment. Implied to be nano-technology or matter teleportation; how or why is never precisely explained. Counts as [[AppliedPhlebotinum applied phlebotinum]]
* InvisibilityCloak: The American military force that attacks the Academy in the World Purge OVA had this, but they were detected by ''Mysterious Lady.''
* {{Irony}}: The ''Fang Quake'' IS that the American military uses in the novels is based off of Rin's ''Shenlong''. America is copying a Chinese design.
* KickingAssInAllHerFinery: In Season 2 Episode 3, the girls are dressed as Cinderella (complete with PimpedOutDress), and the first to grab the crown off of "Prince" Ichika's head will win the right to be his roommate. As you might expect, they come to blows about this, particularly Houki (with her katana) vs. Laura (with her knives), and it is ''awesome''.
* LapPillow: Tatenashi does this for Ichika in episode 2 of season 2 after she knocks him out moments earlier. Laura walks in on them, and promptly attacks him with her IS blade, although Tatenashi deflects it with an iron fan.
* LastEpisodeNewCharacter: [[spoiler:The last few scenes of Season 2 Episode 12 show Tabane conversing with Chloe Chronicle, the person responsible in the Light Novels for the [[LotusEaterMachine World Purge Incident]]. It's possible that she would appear in the [[http://www.animenewsnetwork.com/news/2013-12-19/infinite-stratos-light-novels-get-ova-in-2014 third OVA]].]]
* LeeroyJenkins: Laura initially, and Houki at first when she gets her personal IS. Ichika is sometimes forced to utilize this trope since his only default weapon is a sword.
* LeftHanging: [[spoiler:Ichika's fate at the end of Volume 6 of the LightNovel.]] [[spoiler:Laura saves him from the gunshot.]]
** The strange visions Ichika sees in the final episodes of both seasons. There has been absolutely no explanation for these. Doubly so for the second vision because it wasn't in the novels; at least the anime remembered it but it's still a MindScrew.
* LeotardOfPower: Female IS pilot uniforms complete with ZettaiRyouiki.
* LethalChef: Cecilia. This really comes to the fore in Season 2 Episode 10. She decides that the fried chicken Houki is teaching her to make could be "more colorful", so what does she do? Spray perfume on it, and then slather it in hot mustard. Houki then eats a piece...and becomes violently ill. As do Charlotte and Laura.
* LetsGetDangerous: Episode 5 has Yamada-sensei sweeping the floor against both Lin and Cecilia at the same time.
* LightningGlare:
** Houki vs Cecilia vs Lingyin in Episode 5 of season 1.
** Lingyin does this with Charlotte in episode 7 of season 2.
* LimitBreak: An IS' One-Off ability.
* LotusEaterMachine: [[spoiler:Houki, Cecilia, Charlotte, Laura and Rin mentally enter the security system of the IS Academy after it is hacked, and are trapped inside of the World Purge program by Chloe Chronicle so Chloe can activate Chifuyu's IS, Kurozakura.]]
* LoveConfession:
** Houki gives one to Ichika in the 2nd half of the OVA of the first season, but he doesn't hear it because fireworks go off at the same time she says it.
** Kanzashi gives one to Ichika at the end of episode 9 in season 2 and runs away afterwards. Unfortunately for her, when she thinks about it, she realizes she accidentally told him she likes anime instead, because he asked her that just before she said she "liked it" and ran off.
* {{Luminescent|Blush}} CrushBlush: A lot of characters in the anime adaptation (particularly the main female cast) exhibit this when around Ichika. Even Ichika himself is not that immune to this kind of blushing.
* MadeOfIron: Let's be honest, considering all the damage Ichika keeps taking, it is impressive he barely suffers any long-term consequences.
* MakeItLookLikeAnAccident: [[spoiler:The introduction of Cecilia's maid, Chelsea Blanchett, also revealed the truth about the train accident that killed Cecilia's parents. In short, it was no accident, but rather a cover-up of the '''assassination''' of her parents, carried out on orders by someone very high up in the British government, because they found out that the Alcotts had somehow, via illicit means, obtained an [=IS=] core to power some sort of construct that's keeping Chelsea's little sister alive.]]
* MaleGaze:
** Plenty already starting from episode 1 of the anime, as Ichika is the [[TheOneGuy only important male character]]. Also during the few TransformationSequence we see, there seems to be a bit of focus on the girl's bosoms, or their waists.
** In the Yuuki Homura manga adaptation, he finds himself checking out Houki's rear and berates himself for it. That particular scene wasn't present in the novels, the anime, or the first manga, leading some readers to joke that at least in this continuity, Ichika finally has a sex drive.
* MassOhCrap:
** Ichika's class is utterly shocked when Charlotte reveals her true identity and Laura does a WackyMarriageProposal to Ichika after giving him a ForcefulKiss.
** The girls after Rin accidentally kicks Chifuyu in the season 2 OVA
* MegatonPunch: Ichika and Dan Gotanda are often on the receiving end of these.
** A notable instance is on the beach, when Cecilia gets fed up with Rin rubbing suntan oil on her sensitive parts and stands up. Her untied bikini top is left on the towel, and Ichika is innocently staring right at them. He gets a literal MegatonPunch from Cecilia's IS arm.
* MomentKiller:
** [[spoiler:By the end of season 1, Houki finally confessed to Ichika and he's about to kiss her when the rest of his harem show up in their IS Suits in anger with the intent to "punish" him.]]
** Rin and Ichika's moment in the season 2 OVA gets interrupted by Kanzashi, who tells the former to get out of the system so he can go rescue the other girls.
* MoodWhiplash: Episode 5 of season 2. Ichika is walking back to the dorms after having a surprise birthday party thrown for him, [[spoiler:only to then run into Madoka, who pulls out a gun and shoots as the episode ends.]]
** Episode 11 as well. The first 3/4 are nothing but random harem comedy as all the first-year students go on a field trip. The first warning we get that the mood is about to change is when [[BigBad Squall]] appears and offers to take a picture of Ichika & Houki together. We get more comedy afterward as all the girls try to see what pictures are on Ichika's camera, to the point that he accidentally drops it off a cliff while being mobbed. Then in the last few minutes of the episode, [[spoiler:Madoka appears again to kill Ichika with her [[MidSeasonUpgrade new IS "Black Knight"]], Autumn ambushes Houki & Cecilia in her IS, the train that Chifuyu, Maya, & all the other students are on is hacked and hijacked, and Tatenashi is about to throw down with Squall on top of a tower.]]
* MoreDakka / BeamSpam: The ''Silver Gospel'' loves this.
** Yamada has four huge gatling guns which she uses on an attacker in the OVA for season 2.
* MouthfulOfPi: Ichika forces himself to recite Pi as a means to avert [[DistractedByTheSexy thinking naughty thoughts]] about Charlotte as she's changing in the same changing room that she dragged him into.
* MultinationalTeam:
** Ichika and Houki are Japanese, Cecilia is British, Rin is Chinese, Charlotte is French, and Laura is German. The light novels introduced an American pilot, Natasha Fairs, but she's not part of the harem and only appears in two scenes.
** Season 2 introduces Tatenashi Sarashiki, the IS representative for Russia. Her sister Kanzashi is the rep for Japan.
* MythArc: Starting with the second season: What is Phantom Task up to? And [[spoiler:who is Madoka Orimura?]]
** Another one that has spanned the entire series: who keeps sending unmanned IS drones to attack the Academy?
*** Eventually revealed to be [[spoiler:Tabane. The light novels clarify that she uses the ''Golems'' to gather real life battle data from Houki.]]
** Why is Ichika the only male who can use an IS? Or rather, this feels like it ''should'' be a MythArc, [[SubvertedTrope but no one really dwells on it.]]
[[/folder]]
[[folder:N - Z]]
* NakedApron: Laura wears one in the season 2 OVA ''World Purge''. [[spoiler:And in the ending credits, she's still wearing it, and while running, attempts to hold the apron down to prevent it from revealing her body too much.]]
* NakedFirstImpression: {{Downplayed|Trope}}. Ichika {{accidental|Pervert}}ly catches Houki wearing only a ModestyTowel after he walks into their shared dorm room for the first time, which starts off their relationship in the wrong foot.
* NamedWeapon:
** Apart from the IS units having their own names, their weapons are named as well. A proper example would be the Yukihira Type-2 for Ichika's ''Byakkushiki'' - also at the time of its introduction, his only equipped weapon.
** Outside of her ''Akatsubaki'', Houki owns a sword named Akeyou, as revealed in Volume 2.
* NewTransferStudent: Ichika, followed by [[ChildhoodMarriagePromise Rin]], [[HoYay Charles]], [[AxCrazy Laura]] and finally Charles as his... er, ''[[UnsettlingGenderReveal her]]'' authentic self, Charlotte.
* NippleAndDimed: Averted in the Blu-Rays, in all their uncensored glory.
* NoEndorHolocaust: While relaxing in the bar in the series' final episode, Maya mentions to Chifuyu that there were "zero casualties" from the big battle against Phantom Task. That's... pretty impressive considering entire city blocks were getting blown up by Madoka's GameBreaker of a suit, not to mention Squall deploying a SphereOfDestruction too.
* NoHoldsBarredBeatdown: Laura delivers such a mean-spirited thrashing to Cecilia and Rin in Episode 7 that the damage sustained by their IS made them unable to participate in the actual school tournament.
* NoRomanticResolution: In the anime at least, none of the girls hook up with Ichika at the end. Houki does seem to have a significant lead over them in the second half of the season 1 OVA, but [[ObliviousToLove Ichika]] gets [[MomentKiller distracted by some fireworks.]]
* NoSell: Cecilia and Laura fire some big shots in episode 12 of season 2 at Madoka. Despite the large explosion, the latter emerges unscathed from the attacks.
* NoSocialSkills: Laura to the hilt. First she calls Ichika her ''bride'' after kissing him on the lips in the classroom; she sneaks on to his bed one night ''[[SleepsInTheNude naked]]''; and then in the 4th book, [[spoiler:she licks the cream from a crepe off of Charlotte's ''lips'', to Charlotte's chagrin.]]
* NonUniformUniform: Rin has detached sleeves on her uniform, Cecilia has a knee-length dress in the style of the uniform, Laura forgoes the skirt/dress altogether, opting for pants and boots, and of course Ichika's uniform is completely different from everybody else due to being the only guy in the academy.
* NotWhatItLooksLike: Ichika is often in these predicaments, but it generally doesn't stop him from getting beat up by the girls, such as when Houki finds him being held against his will in his bed by a naked Laura in episode 9 of the first season.
* OccidentalOtaku: The vice-captain of the [[AmazonBrigade Schwarzer Hase]], Clarissa Harfouch, who regularly gives Laura advice on Japanese culture and pursuing Ichika based on manga and anime.
* OffscreenMomentOfAwesome: One happens during the end of episode 10 in season 2, [[spoiler:when Tabane is surrounded by three Phantom Task members. One tried to [[TamperingWithFoodAndDrink spike her soup with a sleeping drug]], another [[ClickHello put a gun to her head]], and Madoka [[DynamicEntry crashed through the restaurant wall in her IS suit.]] Tabane [[CrouchingMoronHiddenBadass effortlessly subdues]] all three of them with little more than a few swift kicks, a butter knife, and a fork.]]
* OrbitalShot: When Cecilia and Ichika duke it out in Episode 2.
* ParentalAbandonment: If you are a main cast of this show, it is a must that you don't have any parents present with you. To wit:
** Ichika and Chifuyu's parents abandoned them, leading Chifuyu to [[PromotionToParent raise Ichika by herself.]] And then there is the little detail that Ichika doesn't have baby photos at all.
** Houki's entire family had to constantly move around due to her older sister Tabane introducing the IS system, and thus needs protection, causing Houki to hate Tabane for it.
** Lingyin's parents divorced due to differences and the restaurant that Ichika used to visit has closed.
** Cecilia's parents died from a train accident, forcing her to protect her family's treasure from pretenders by herself.
** Charlotte is the [[HeroicBastard illegitimate child of a (now-deceased) country woman]] and the CEO of the French IS company who abandoned him[=/=].
** Laura's a genetically enhanced SuperSoldier and was raised in a military environment, and thus had no parents.
* PatientChildhoodLoveInterest: Two of them in Houki and Rin. Funnily enough, though, they never met each other until the series started; Houki moved away from Ichika when they were six years old, and Rin moved into the same neighborhood when he was seven.
* PiggybackCute: Ichika carries Houki on his back after the photoshoot in season 2 episode 7. In the novel version of this scene it was a BridalCarry.
* PlotBasedVoiceCancellation: Houki gives a LoveConfession to Ichika in the second OVA episode, but she says it just as fireworks go off in the distance, which distracts Ichika long enough that he doesn't hear it.
* ThePowerOfLove: Chifuyu and Ichika both claim that their skill comes from protecting others. [[spoiler:Laura]] decides that if she wants to be stronger, she needs to follow their example.
* PoweredArmor: The IS qualify, being mecha-suits made of nanomachines.
* ThePromise: Ichika, being the clueless harem hero, misinterprets his [[ThroughHisStomach promise]] with Rin and prompts another angry duel.
* PunchedAcrossTheRoom:
** Rin does this to Ichika after he hastily opens her door, to find her wearing just a bikini top and short shorts.
** A more serious example occurs in episode 9 of season 2, when an unmanned IS suit throws him into Kanzashi after the latter is frozen in fear.
* RedAndBlackAndEvilAllOver: Laura's IS is also this color scheme, possibly as a ShoutOut to Elzam, as the series likes to reference other mecha anime. And she does a HeelFaceTurn as well (Sort of).
* SchizoTech: While the date for the series is never given, the Manga and the Anime specifically show President Obama as the main driving force behind IS Academy and the Alaska Treaty, placing the unveiling of the IS somewhere between 2009 to 2016. Considering that the IS is an artificial intelligence embedded into what seems to be a fusion reactor or zero-point energy source roughly the size of a baseball or smaller...yeah, you get the picture. Granted, Shinonono Tabane is rumored to be a genius who makes '''Einstein''' look dumb.
* SchmuckBait:
** In Episode 10, Ichika comes across Houki staring at a sign behind two metal flaps which says "Please pull them out." She doesn't. [[IdiotHero Ichika can't resist]]. Though, given the little carrot on the sign (and the very shape of the trap itself) made it quite obvious who was behind the trap, Ichika probably thought something along the lines of 'The sooner, the better'. After all, none of them seemed too happy about seeing Tabane.
** In episode 10 of season 2, Ichika complains about being chosen to measure the girl's bodies. Yamada-sensei simply says that's what the StudentCouncilPresident [[ScrewTheRulesIMakeThem Tatentashi wanted]]. Chifuyu gives him a blindfold to use, but unfortunately, it's a see-through, so it doesn't block his view much. One wonders why he didn't just ask Yamada-sensei, who was recording the measurements, to switch jobs, particularly after his UnwantedHarem find out he's measuring the other girls.
* ScrewTheRulesIHaveConnections: Apparently (in the manga at least) Lingyin was able to enroll in the IS academy despite not taking the entrance exams by begging her uncle, a high-ranking officer in the Chinese military, to pull some strings for her.
* SeizaSquirm: Happens to Cecilia in episode 10.
* SenseiChan: Yamada-sensei.
* SeriousBusiness: In episode 3 of season 2, Ichika is asked to take part in a play. He's told what he'll have to do as things occur on the play, and the play turns out to be a variation of Cinderella. Except that it's a group of elite assassins, consisting of the main girls in the show, most of whom attack him with full force, demanding the crown he's wearing in the process. [[spoiler:In a short FlashBack, the student council president told them whoever could get his crown would get to be Ichika's roommate. She also apparently told many of the other girls at the school, as a short while later they all take part as well. She also never told Ichika about this, and shocks him when he tries to just give the crown to Charlotte, hence his confusion as to why the girls want it so badly.]]
* SexyWhateverOutfit: The girls wore animal-themed outfits in season 2 episode 5, in a "secret battle to please Ichika". Cue bits of supposed DistractedByTheSexy and heaploads of MaleGaze.
* ShoutOut: Some of the IS suits including their weapons, coloration, and names are a shout out to various mecha anime, particularly to the Franchise/{{Gundam}} and ''VideoGame/SuperRobotWars'' franchises:
** Ichika's ''Byakushiki'' (Type-White) is this to a white re-painted version of Char's [[Anime/MobileSuitZetaGundam Hyakushiki]] (Type-100) that appeared in ''[[Anime/ModelSuitGunplaBuildersBeginningG Mobile Suit Gunpla Builders Beginning G]]''. It so happens that said [[[[http://www.mahq.net/mecha/gundam/gunpla/msn-00100-gpb.htm repaint]] shares the same name.
*** His MidSeasonUpgrade ''Setsura'' is also this, but to the [[Anime/MobileSuitGundamSEEDDestiny Destiny Gundam]].
** Houki's ''Aka Tsubaki'' draws a lot of parallels from [[LawOfChromaticSuperiority red mobile suits]], particularly the [[Anime/MobileSuitGundamSEED Aegis (Shape and Color Scheme)]] and [[Anime/MobileSuitGundam00 Arche (The feet-mounted beam blades)]] Gundams.
** Cecilia's ''Blue Tears'' (Particularly the {{Attack Drone}}s and the hip-mounted weapons) is a clear reference to the [[Anime/MobileSuitGundamSeedDestiny Strike Freedom]].
** Rin's ''Shenlong'' was named from [[Anime/MobileSuitGundamWing an After Colony-era Gundam of the same name.]]
*** Supposedly inverted in the ''Glory of Losers'' manga reboot, where the ''[[http://images.wikia.com/gundam/images/5/58/Up84836.jpg Laoiya]]'' sword add-on to the same Gundam shares a similar silhouette to the ''Souten Gagetsu''.
** Charlotte's ''Rafale Revive Custom II'' is not just an AceCustom variant piloted by a CharClone. [[https://www.youtube.com/watch?v=5T0-SyZmLqY Thanks to that Pile Bunker attack on Laura,]] it is also an [[VideoGame/SuperRobotWarsCompact2 Alt Eisen expy]].
** Laura's ''Schwarzer Regen'' is primarily black with red and yellow/gold trim. Wonder why she [[VideoGame/SuperRobotWarsOriginalGeneration hadn't overridden anyone's theme song yet]].
** In episode seven, there's a list of representatives who are going to watch the tournament. [[http://i55.tinypic.com/28ti4g9.jpg One of them]] is [[Series/TheOfficeUS Michael Scott]].
*** In episode 8, it looks like Michael [[http://oi54.tinypic.com/21l61pi.jpg chose to attend after all]].
** Episode 9 is called Film/OceansEleven
** Episode 10 is called Film/TheThinRedLine.
** In episode 11, Houki and Ichika's OutOfClothesExperience wouldn't be much of a ShoutOut by itself, unless you watched the third episode of ''[[Anime/MobileSuitGundamUnicorn Gundam Unicorn]]'' and realize that Ichika and Banagher [[ActorAllusion have the same seiyuu.]]
** The preview of episode 12 has a similar thing that happens with Anime/NeonGenesisEvangelion. All it lacks is [[GainaxEnding the "Congratulations" scene.]]
** The [[http://baka-tsuki.org/project/index.php?title=File:IS_v08_004-005.jpg ultra-cool battle suit and the half dozen katanas]] Chifuyu uses in the World Purge OVA to fight the ''Fang Quake'' IS. She's practically a female version of [[VideoGame/MetalGearRisingRevengeance Jetstream Sam.]]
* ShowerOfAwkward: [[spoiler:How Ichika finds out Charlotte's true gender.]]
* TheSmurfettePrinciple: Inverted. There are very few male characters in this series. Besides Ichika, there is his middle school buddy Dan who gets maybe a grand total of 2 minutes screentime in an entire season (he appears a bit more frequently in the novels), the robbers in the 2nd season's first episode, and a few flashbacks of some characters' fathers.
* SpellMyNameWithAnS: There seems to be a disparity with some characters' last names. Rin's name causes issues depending on whether you're romanizing from the Chinese or Japanese pronunciation, and with the former, depending on what dialect you're doing. Just look at how many times her name is used interchangeably on this very page as either "Rin" or "Ling(yin)." The J-Novel Club official translation specifically has only Ichika refer to her as "Rin" and uses "Ling" in all other instances.
** Charlotte's surname also causes issues. It's written as "Dunois", but read as "Dunoa" (which is also close to the correct French pronounciation, which would be "doo-nwah").
** Another example would be the joint US/Israeli IS unit that caused a ruckus over the skies of Japan. While it's written as "Silver Gospel", plus having its kanji title be a direct translation of that, the "Silver" part is always read as the very [[GratuitousSpanish Spanified]] "Silverio".
* SpiderSense: In the ''World Purge'' OVA, Ichika senses that something is wrong and that he's needed back at the Academy while his IS suit is getting repaired. [[spoiler:This happens right after Tatenashi gets shot, and calls his name out.]]
* StayInTheKitchen: Possibly {{gender flip}}ped. The revolutionary IS suits, having made most other weapons obsolete, can only be piloted by women, which kinda leaves the men in a bad place, combat-wise.
* {{Stripperiffic}}: An excellent example of Stripperiffic PoweredArmor.
* SuperPrototype: [[spoiler:Ichika's Byakku Shiki is actually a 4th Generation Prototype. However, as a testbed for new technology and concepts, its full of flaws making it more of a FlawedPrototype.]]
* SuspiciouslySpecificDenial: In season 2 [[spoiler:after Ichika survives Madoka's assassination attempt on him, he runs into Chifuyu and point-blank asks her if they have a sibling named Orimura Madoka. Chifuyu answers with, "you're my only family" and walks away. Which, you may notice, [[NonAnswer does not answer Ichika's question]].]]
* TakingTheBullet: Well, it was a sword attack, but [[spoiler:Tatenashi takes the blow for her sister Kanzashi in episode 9 of season 2 when the latter is standing helpless while watching Ichika get thrown around by the unmanned IS suits.]]
* TakingYouWithMe: Tatenashi attempts this with the unmanned IS suit attacking her and Houki in episode 9 of season 2. A big explosion follows her attack, [[spoiler:but it fails to stop the suit, and Tatenashi is lying in the rubble.]]
* TalkingIsAFreeAction:
** Happens with Ichika and Houki in episode 11 of the first season.
** Occurs again in episode 9 of season 2, this time with Kanzashi, Tatenashi, and Ichika.
* TechnologyPorn: The series is loaded with this trope.
** [[spoiler:Houki's MidSeasonUpgrade, Aka Tsubaki, utilizes all the technology in the Byakku Shiki after all of its flaws had been corrected, making it the true 4th Generation SuperPrototype.]]
* ThanksForTheMammary:
** When a shaky entry by Yamada-sensei in her IS results in crash landing on top of Ichika, after the dust clears he finds himself ''on top of her with his hand on one of her boobs.'' Unlike most girls, she doesn't react violently to it, and instead hints something about becoming Chifuyu's 'sister-in-law' loud enough for the other girls to overhear.
** Tatenashi does this to Houki in episode 8 of season 2.
* TheyCallMeMisterTibbs: Chifuyu [[strike:prefers]] DEMANDS the students to call her Orimura-sensei. Those who don't will get whacked with her attendance book. Even her brother. ''Especially'' her brother.
* TheThingThatGoesDoink: Appears as a background prop of sorts in [[BirthdayEpisode season 2 episode 5]].
* ThinkUnsexyThoughts: Ichika is forced to do this after Charlotte drags him into a changing room. He does it largely by reciting Pi. All the while still imagining Charlotte's figure.
* ThrowingYourSwordAlwaysWorks: Subverted. Rin does this in episode 3 of season 2 during the Cinderella play, but Ichika blocks with Charlotte's riot shield at the last minute. While it does prevent the sword from hitting him or Charlotte, it also shatters the shield.
* TournamentArc: Played with, almost to the point of a running gag. Every time a tournament begins, Ichika always ends up fighting against the respective arc opponent(s) in the very first round, of the very first match, and something always goes wrong in said match that ends up getting the entire tournament cancelled.
* TransformationTrinket: The IS, sort of. The Season 2 opening theme highlights it: Houki's wrist-charms, Cecelia's earrings, Rin's bangles, Charlotte's necklace, Laura's thigh-holster, and Ichika's wristband can all transform into their respective IS Suits.
* {{Tsundere}}: Houki, a clear Type B. Possibly justified by [[ObliviousToLove Ichika's personality]].
** Cecilia after her battle with Ichika.
** Most of the female characters actually fit this. Charlotte may be the only one who averts this.
* TwoTeacherSchool: Chifuyu and Maya are the only two teachers who get a decent amount of screentime for the teachers. Although other teachers are referenced, these two are the only ones that are seen regularly for the faculty at the school.
** There was Canadian math teacher Edwards Franchee from the novels, seen in Volume 7 Chapter 3.
* UnsettlingGenderReveal: Charlotte to Ichika on Episode 5, and three episodes later, to the entire class via Yamada-sensei. Obviously some girls (''especially'' [[{{Yandere}} Lingyin]]) didn't take the implications well, especially considering it was known to everyone that she (as Charles) shared the public bath with Ichika the previous day.
* UnwantedAssistance: When Houki, Rin, and Cecilia all try to explain to Ichika how to use the IS with their {{Technobabble}}, it only serves to confuse him. On the other hand, Charles offers to duel Ichika, and after soundly [[CurbStompBattle stomping him]], he offers some tips on Ichika's weaknesses and explains things that makes it easy for him to understand. He also helps train Ichika on using a rifle, and seems a bit too friendly, causing the girls to get quite [[ClingyJealousGirl jealous]].
* UnwantedHarem: The premise of the show, if you don't count the PoweredArmor.
** An interesting scene occurs at the beginning of episode 10 in season 2, [[spoiler:after Kanzashi joins the harem. All of the other girls are sitting around her, and grilling her with rumors of her dating Ichika. Charlotte seems to calm them down briefly and offers Kanzashi a drink, [[BewareTheNiceOnes only to then ask the same question]], while also having a {{Yandere}} look, until the poor girl clears up the misunderstanding, which calms them all down when they realize he's not dating anyone...yet...]]
* VillainousRescue: Ichika in episode 3 of season 2, runs away from a gaggle of girls chasing him during the play. [[spoiler:He's saved by the lady who wanted to put her business's attachments onto his IS suit when she hides him underground. However, she's developed an AxCrazy look on her face, and at this point simply demands his suit.]]
* [[ViolentlyProtectiveGirlfriend Violently Protective Harem]]: Why else would they go after the rogue IS despite being told to standby?
* WackyMarriageProposal: [[spoiler:After she's done shoving her tongue down his throat, Laura claims Ichika as her ''wife'' in front of their entire class and the rest of Ichika's harem.]]
* WhamLine: At the end of episode 8 in season 2, Kanzashi reluctantly accepts Ichika as her partner for the upcoming tournament. He also enlists the help of several other girls to fix the problems in her IS suit to get it working. She is later seen carrying some muffins to his room, [[spoiler:only to stop when she sees her sister Tatenashi leaving his room, and asking if the plans she gave him for fixing up Kanzashi's suit helped. Kanzashi runs away and cries in her room after finding out that her sister used Ichika to help with her suit, when up to that point she had adamantly refused any help from her.]]
* WhatBeautifulEyes: Ichika tells Laura this. Interesting in that this is also the first time Ichika is able to get a good look at both of her eyes at once up close (Laura had removed her eyepatch to deploy her [[DeflectorShields Active Inertia Canceller]]). The first time it happened in the first season, there was [[SuperpowerMeltdown too much going on for him to focus on it.]]
-->'''Ichika''': They look like gemstones...\\
'''Laura''': ''[[[LuminescentBlush blushing intensely]], to herself]'' Beautiful...Ichika said that I look beautiful...
* WhatIsThisThingYouCallLove: Laura falls in love with Ichika after he saves her life. However, growing up in a strict military academy left her with NoSocialSkills, and she has no idea of how to properly express these feelings.
* WhatTheHellHero:
** Laura, Cecilia, and Rin attacks Ichika rather forcefully during the play he's been asked to take part in during episode 3 of season 2. See the entry for SeriousBusiness for further details.
** To a lesser degree, anytime one girl tries to do something with Ichika by herself, and either he invites the other girls, or more likely, the others tag along after spying on them.
* WhenAllYouHaveIsAHammer: It turn out the worlds' best IS pilot uses only one blade and nothing else.
* WireDilemma: In Volume 5, Ichika and Dan participate in one. Ichika proceeds to cut the wires leaving with Red (Houki/Akatsubaki) and Blue (Cecilia/Blue Tears). Ichika then asks Dan as to which one he should cut. [[spoiler:Dan picks blue and they fail in defusing the fake bomb.]]
* WithGreatPowerComesGreatResponsibility: Ichika says this in Episode 11 when Houki got the newly gained Aka Tsubaki during their fight against the Gospel.
* TheWorfEffect:
** Cecilia and Rin, being national representatives and possessing custom 3rd generation IS suits, are touted as being the most powerful pilots in the school. Cue them getting {{curbstomp|Battle}}ed by both Yamada-sensei and Laura in separate occasions, with both fights even being a two-on-one.
** Ichika is frequently beaten to demonstrate how serious a new threat is.
** Tatenashi suffers from this in episode 9 of season 2, after having been shown largely effortlessly delivering one CurbStompBattle after another in earlier episodes.
** ''Madoka'' gets hit with this when her suit is destroyed in episode 10.
** Remember how tough Autumn was in episode 4? [[spoiler:She's not so tough against Houki & Cecilia in the season finale. Especially since ''they weren't even paying attention to her'' for most of the fight.]]
** During the World Purge incident, a U.S. special forces team is effortlessly repelled by Tatenashi's ''Mysterious Lady''.
* WorldOfActionGirls: Barring Ichika of course, most of the cast and background characters are {{Action Girl}}s.
[[/folder]]
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[[TwentyMinutesIntoTheFuture Sometime in the future]], a new [[PoweredArmor exoskeleton]] called the Infinite Stratos (IS) system was developed in Japan and quickly demonstrated just how [[CurbstompBattle easily it could take out a variety of conventional military weapons]]. The weapon was soon adopted by several nations... save for one flaw -- [[GirlPowered only women could pilot it]]. This [[SlidingScaleOfGenderInequality shifted the social structure to favoring females over males]], until EveryMan Ichika Orimura becomes the first male to activate an IS and is soon thrust into a new life as a new student at the prestigious -- and previously all-female -- Infinite Stratos Academy.
However, his school life is filled with many hurdles and interesting characters. His {{Tsundere}} childhood friend Houki Shinonono is one of his classmates, but her sister Tabane is responsible for building the IS and Houki hates her for it. English UpperClassTwit Cecilia Alcott hates weak men and has trouble finding a decent guy. Flat-chested (and [[ACupAngst not too happy about it]]) Chinese GenkiGirl Huang Lingyin is Ichika's second [[ForgottenChildhoodFriend childhood friend]]. From France, there's also Charlotte Dunois, briefly known as another male pilot who [[HoYay tries to be friendly]] and get close to Ichika before her gender is revealed... and she still wants to be friendly. Finally, German SuperSoldier Laura Bodewig idolizes legendary IS pilot Chifuyu Orimura, who happens to be Ichika's older sister, and therefore hates him for ruining her idol's reputation. Oh, and naturally, there's an evil corporation that wants to steal his IS Core.
Ichika's high school life is about to get very interesting...
''Infinite Stratos'' is a series of LightNovels written by Izuru Yumizuru and illustrated by Okiura (from volumes 1 to 7) and later CHOCO (volume 8 and onward), first published in 2009. As of 2018, there are 12 volumes released. The light novels were licensed for a North American release by J-Novel Club in February 2018 with the first volume getting chapter posted online as they're translated before a full ebook release on April 16, 2018. The series [[https://www.animenewsnetwork.com/news/2018-04-25/infinite-stratos-light-novel-series-ends-in-13th-volume/.130803 will conclude]] with its thirteenth volume, with its release date yet to be revealed.
''Infinite Stratos'' was adapted into an anime in January 2011, simulcast with [[http://www.theanimenetwork.com/Anime/Infinite-Stratos/Info The Anime Network]]. There are two manga adaptations of the story: the first by Kenji Akaboshi, covering the entirety of Season 1; and the second a relaunch by Yuuki Homura. Season 2 aired as part of the Fall 2013 anime season. It's also available on Crunchyroll's [[http://www.crunchyroll.com/infinite-stratos website.]] Viewers living in the USA, Canada, Australia, UK, Ireland, and South Africa may watch it legally there. The anime is also licensed for release by Creator/SentaiFilmworks.
Less than 24 hours after season 2's final episode aired in Japan, it was announced that an OVA based on Volume 8 was in production. It was released on November 26, 2014. [[https://www.youtube.com/watch?v=rdJAQM80qUQ Trailer here.]]
A fighting game for the PC called ''Infinite Stratos Versus Colors'' was released on December 31, 2014. View the trailer [[https://www.youtube.com/watch?v=YppzMhUrx54 here]].
Not related to ''Anime/{{Stratos 4}}''. Nor to [[Anime/MobileSuitGundam00 Lockon Stratos]].
'''Warning!''' Both the main page and the character sheet have spoilers for the light novels as well as the anime. Administrivia/YouHaveBeenWarned.
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!!Gen. 4 Infinite Tropes:
[[foldercontrol]]
[[folder:A - M]]
* AbridgedSeries: [[https://www.youtube.com/watch?v=gWC6HLEHgbw One by AnimeRevAbridged]] and [[https://www.youtube.com/watch?v=qG9uuzMcLr0 Infinite MENT]] which follows the style of ''WebVideo/CodeMENT''.
* AcademyOfAdventure: IS Academy, more or less. Doesn't help that it's on an island, and thus is the only major setting in the series.
* AccentAdaptation: Given the very clear nature of where Cecilia, Charlotte and Laura are from, the English dub gives them British, French and German accents.
* TheAce: Tatenashi Sarashiki, the [[SoBeautifulItsACurse beautiful and attractive]] StudentCouncilPresident who's virtually the strongest IS pilot in the entire academy. She is also the head of the family that [[DepartmentOfRedundancyDepartment leads an organization fighting an evil secret organization]], [[ArsonMurderAndJaywalking and has a sister]] [[TheGloriousWarOfSisterlyRivalry who has a massive inferiority complex]]. She can also tame (and in some cases troll) everyone in Ichika's harem, including Ichika himself. The catch? [[spoiler:Even our Celibate Hero thinks that she's just too perfect and virtually unreachable, which makes her the ''only'' female protagonist whom he (unwittingly) hasn't managed to get roped into the harem. Doesn't stop her from forcing herself into it though.]]
* ActionPrologue: The first anime season begins with a mid-air skirmish. In actuality [[spoiler:it is the skirmish versus Silver Gospel in the final episode]].
* AdaptationInducedPlotHole: The anime fails to explain how Ichika knew Cecilia was within firing range against the berserk unmanned IS. The LightNovels explain that he secretly communicated with her to fire on his command after unleashing Yukihira Type-2 by taking advantage of its barrier-nullifying ability. Cecilia, being frustrated to not be able to help out, [[JumpedAtTheCall answers the call]].
* AlmostKiss:
** [[spoiler:At the end of season 1, Ichika and Houki are about to kiss. [[MomentKiller Then]] [[ClingyJealousGirl the rest of the girls]] [[OhCrap show up]].]]
** Another one occurs in the season 2 OVA ''World Purge'', in which the girls discuss kissing Ichika to wake him up after his mind is still trapped in the virtual world. [[spoiler:While they're discussing the topic, Kanzashi just decides to try and kiss him, but she's pulled away just before she's able to.]]
* AlternateCharacterReading: Kanji that roughly translates as "Fallen Nation Corporation" is given the English reading of "Phantom Task". This doubles as a reference to the in-series nickname given to the [[Anime/MobileSuitGundamSEEDDestiny 81st Autonomous Mobile Group]], otherwise known as "Phantom Pain".
* AlwaysInClassOne: Ichika's class is 1-1.
* AmazonBrigade: The Schwarzer Hase (Black Rabbits), the German IS squad that Laura belongs to. As of episode 11, Ichika's harem has crystallized into this.
* AndNowYouMustMarryMe: [[spoiler:After Ichika saves Laura's life, she responds by [[ForcefulKiss sticking her tongue down his throat]], declaring him to be "her wife," and in the next episode, climbing into bed naked with him.]]
* AnimationBump: The IS' are noticeably more fluid than everything else.
* ArtShift: Expect this for the oncoming volumes (and reprints of previous volumes) with CHOCO taking Okiura's reins.
* AttackDrone: Cecilia's IS is armed with four remote controlled drones armed with lasers that she can use to perform all-range attacks on opponents. The unmanned IS "Golem" also counts. The "Silver Gospel" IS was this in the anime (it had a pilot in the novels, though).
* AwLookTheyReallyDoLoveEachOther: Chifuyu may smack Ichika around a bit, and he complains, but she'll do anything to protect him, and he wants to be an IS pilot so he can return the favor.
** Also [[spoiler:Laura]] is far more lovey-dovey towards Ichika than you'd expect.
* AwesomeButImpractical: Byakkushiki's main armament can (in theory) pierce any defense, at the cost of hemorrhaging shield energy. In practice, Ichika is nearly guaranteed to lose once he activates it.
* BackToBackBadasses: Laura and Charlotte briefly in episode 1 of season 2, after they take out some crooks holding up the cafe they were briefly working at.
* BadassAdorable:
** [[spoiler:Charlotte]]. Despite being a very shy and sweet girl, she can hold her own against 3rd generation IS machines with her slightly-inferior 2nd-generation IS.
** Laura post-[[DefrostingIceQueen meltdown]] also counts due to being TheComicallySerious one with NoSocialSkills.
* BadassArmFold: Laura is prone to do this with her IS
* BalancedHarem: Houki and Rin are Ichika's [[PatientChildhoodLoveInterest childhood friends]], Cecilia and Charlotte have their {{Fanservice}} moments with him, and Laura stole his FirstKiss. Therefore, there was really no way to tell who's got the edge. Houki seems to have pulled into the lead after the first OVA, but it still looks like a setup for NoRomanticResolution.
* BareYourMidriff: The male variant of the IS suit, but only in the anime.
* BarehandedBladeBlock: Around the middle of the first episode when Houki attacks Ichika
* BattleHarem: As his co-homeroom teacher Maya once stated, with his force of six representative pilots, he has more than "enough to start a war."
* BeachEpisode: Episode 9 takes place at a resort for a beach study session.
* BedmateReveal:
** In Episode 9 of season 1, [[spoiler:Ichika wakes up and finds Laura naked in bed with him.]]
** She does it again in episode 1 of season 2, although this time she's wearing a school swimsuit.
** In a slight variation of this trope, Tatenashi does this to Ichika as well in the ''World Purge'' OVA. He accidentally sees her topless after waking up in the nurse's office, hides under the sheet, and innocently asks if she's feeling better after suffering a gunshot wound. [[spoiler:Instead of getting mad at him though, she jumps into his bed, demanding he do lewd things with her too after hearing about what happened to the other girls in the virtual world.]]
* BerserkButton: Lingyin doesn't like being called flat-chested.
* {{BFG}}: Tatenashi uses one in episode 12 of season 2. It's so large relative to her that she has to fire it from the ground.
* {{Bifauxnen}}: Charles's real name is Charlotte, forced into drag so France could gather Ichika's IS data. He finds out pretty quick and helps her hide it due to her situation.
** Makes a return in Season 2 Episode 1, when [[spoiler:Charlotte is hired as a waitress...yet the restaurant still has her wear a butler's uniform. Apparently she looks better in that outfit than even some ''guys'' do.]]
* BirthdayEpisode: Episodes 5 of season 2, which celebrates Ichika's birthday.
** Season 1, Episode 11 took place on the 7th of July, Houki's birthday. Unlike most examples, her birthday is... not a happy one (until the end, when Ichika gives her a new ribbon and shows that he remembered it was her birthday).
* BlackBox: {{Invoked|Trope}} in reference to the IS Cores.
* BlandNameProduct:
** Episode 3 has Pocari Sweat spelled as "Pokari Sweat" however it is superimposed by Rin's hands.
** Averted in the first season OVA as Cecilia is obviously holding a pair of bottles of Tabasco sauce while cooking. Or [[LethalChef trying]] to cook.
** Cecilia wears "L'Ireal" perfume in the novels, an obvious stand-in for L'Oreal.
** "Sugar and Honey" chapter 9 has Laura holding an "[=IPid=]" tablet.
* BoobsOfSteel: All IS pilots and students (except for Rin and Laura) are well-endowed to some extent but Houki, Maya and Tatenashi stand out in particular.
* BreatherEpisode:
** Episodes 5 and 9 in the first season, which are sandwiched between episodes with intense action and drama scenes.
** Episode 5 in season 2, following the episode where Ichika was in a fight for his life. [[spoiler:Subverted at the end however, when Madoka shows up, and we hear a gunshot as episode ends.]]
** Episode 10, season 2. Following a brutal fight in which several of the students were seriously injured, this episode focuses on Cecilia largely trying to be a less LethalChef, but accidentally sickening the other girls in the process. And even during a more serious dramatic moment at the end with Tabane is subverted, [[spoiler:when she delivers a CurbStompBattle to three of the Phantom Task members, including one with a gun, and another in an IS suit, utilizing nothing more than a few kicks, a butter knife, and a fork.]]
* BridalCarry: Ichika does this to help Houki getting in her training IS, much to the latter's delight.
** [[spoiler:Ichika does it to her again at the end of season 1 to get both of them away from the rest of his (furious and jealous) harem.]]
** [[spoiler:In novels, he does it quite frequently, about 3 times to Laura and once to Kanzashi]]
* BrotherSisterIncest: Some of the girls worry that Ichika and Chifuyu might have this kind of relationship (as if they needed ''another'' romantic rival), especially after eavesdropping on a suggestive-sounding massage though it [[SubvertedTrope turns out to be nothing]]. He also looks after the house and Chifuyu in the same manner as some might expect of a wife, much to the other girls' dissatisfaction.
** In Vol 4, chapter 4 (and the OVA), it explains that Chifuyu is bothered by the fact that the girls had silently declared her as the ''strongest rival'' despite that not being her intention at all. [[spoiler:But considering her confession to Maya, Maya concluded that Chifuyu is actually [[UnresolvedSexualTension indecisive/ confused about her own feelings toward Ichika]]. [[FanFicFuel Now we can freely decide that the the ship should]] [[BrotherSisterIncest sail]] or [[ShipSinking sink]]...]].
* [[BunnyEarsLawyer Bunny Ears Scientist]]: Tabane Shinonono (complete with actual bunny ears). She may act like a CloudCuckooLander, but she ''is'' the creator of the IS machines.
* CannotSpitItOut: Played straight for most of the series with the exception of [[spoiler:Laura post-[[DefrostingIceQueen defrost]]]], but averted with at least two girls who actually have a shot by the end of the series. In episode 8, [[spoiler:Charlotte]] gives Ichika a [[FuroScene naked hug in the bath]] and declares she wants to be with him. At the end of the same episode, [[spoiler:Laura]] sticks her tongue down his throat and [[SugarWiki/FunnyMoments declares him to be her wife]].
** Houki tried to avert this trope ''thrice'': at the end of episode 12, she [[SkinshipGrope puts Ichika's hand on her chest, right over her cleavage]], and flat-out asks "You ''do'' know I'm a girl, right?"; in the second part of the OVA, she confesses to him but he gets distracted by the fireworks. What's worse, the explosion from the fireworks muted out her confession. Then in the second season's 7th episode, as Ichika was carrying her home from their photo shoot, she mumbled out a confession to him, but since she was so tired that she fell asleep after saying it, Ichika didn't think much of it. In the novel version of that scene, she was very drunk and slurring her words, so Ichika didn't understand her.
* CastFromHitPoints: Ichika's special attack drains his own meager shields in order to launch a devastating attack that can theoretically 1-shot his opponent. That is, if his shields aren't worn down before he can get close enough to use it, or if the target doesn't simply dodge the attack first.
* TheCastShowOff: The ending theme song, ''Super Stream'', is sung by Ichika's harem girls.
** Episode 1: [[Creator/YokoHikasa Houki]].
** Episode 2: Add [[Creator/{{Yukana}} Cecilia]].
** Episode 4: Add Ling[[Creator/AsamiShimoda yin]].
** Episode 6: Add [[spoiler:[[Creator/KanaHanazawa Charlotte]].]]
** Episode 8: Add [[Creator/MarinaInoue Laura]].
** The second season ending song ''Beautiful Sky'' is done the same way. And as of Episode 9 and 12, add [[spoiler:[[Creator/SuzukoMimori Kanzashi]] and [[Creator/ChiwaSaito Tatenashi]], respectively.]]
* CatchAFallingStar: After Kanzashi's IS Suit blows out a thruster and falls from the sky, Ichika immediately summons his IS and makes a diving save, probably saving her life. [[spoiler:It's about this point where Kanzashi falls deeply in love with him.]]
* ChekhovsGun: Charlotte unlocking the permission for usage of the Rafale Revive's rifle proved to be ''very useful'' when Ichika uses it against Laura in their match.
* ClassRepresentative: Ichika and Cecilia [[WizardDuel fought for the position]] with their [=ISs=]. Cecilia won but handed over the position to the former. Also, Rin became her class's representative after transferring in.
* ClingyJealousGirl: Practically every girl at this point, with Houki at lead position. Back off, bitches. Ichika's ''my'' training partner.
** [[spoiler:Charlotte]] is an exception. As is Laura, oddly enough. You'd think a ProudWarriorRaceGuy would be more violent. Not really. Though Laura's possessive side starts coming out more frequently in the second season.
** And it seems even [[spoiler:[[HotForStudent Yamada-sensei]]]] herself isn't immune to Ichika's charm, judging from her reaction to discovering [[spoiler:Ichika and Charlotte]] together in a fitting room.
** And at the end of the anime, Ichika is caught in a compromising position with [[spoiler:Houki]], sending the rest of his harem into a real jealous rage enough to show up in their IS Suits ready to kick his ass. [[spoiler:Even the sweet and friendly Char is ROYALLY pissed.]]
** All of them are upset with him when he invites them to an outing at a water park in episode 1 of season 2, thinking he only invited them. Then they find out he invited all of them... Laura was the only one who knew from the start that he was going to invite all of them since she was the one who handed him the flyer for the pool in the first place and he was ThinkingOutLoud. And of course, naturally he was [[ObliviousToLove oblivious]] to her sudden sour mood.
*** The second season OVA (which was really just extra footage from the first episode that was cut due to time constraints) shows that the jealousy more or less evaporated once everyone got to the water park, since they were having too much fun there.
* ClothingDamage: Houki's Cinderella dress suffers a little bit in episodes 3 and 4 of season 2.
* CluelessChickMagnet: Ichika, ''Ichika'', '''''Ichika'''''. He's got a truckload of admirers inside (most of his schoolmates, particularly [[{{Tsundere}} Houki]], [[UpperClassTwit Cecilia]], [[ChineseGirl Rin]], Charlotte and [[SuperSoldier Laura]]) and outside (e.g., Ran Gotanda, his junior-high former neighbour) the IS Academy... and he's none the wiser. Somewhat justified, as being the rare male to pilot the female only PowerArmor of the series, plus the fact that he's the ONLY male student in the entirety of the IS Academy makes him the only available choice... And to many girls, quite a good one.
** [[LampshadeHanging Lampshaded]] quite succinctly by Charlotte in the latter half of episode 8:
---> '''Ichika''': ''*On the floor after getting beat up for saying something insensitive again.*''\\
'''Charles''': Sometimes I think you're doing it on purpose.
** Though he get a ''little'' better when some of them confess.
** In the novels he also has Tatenashi's little sister Kanzashi.
** In episode 5 of season 2, when asked which of the girls' performances he preferred the most, he took only a moment to choose Chifuyu's dressing up like a maid and serving him a bite of a parfait. None of [[ClingyJealousGirl the other girls]] take this very well, and even Chifuyu gets flustered by his response.
* ColorCodedCharacters: All of the girls have different colored hair and hairstyles, and all of their IS suits have different colors.
* ContinuityNod: Season 2 Episode 10 has Laura still wearing the adorable cat-pajamas Charlotte bought her in Season 2 Episode 1.
* ContinuityReboot: The anime's second season seemed to be it with [[https://www.youtube.com/watch?v=uipILwmXqgo the first full preview having the word REBOOT]] in it. Except [[NeverTrustATrailer it wasn't.]]
** The second manga adaptation, however, is a reboot. With [[WorldOfBuxom bigger breasts everywhere.]]
* CornerOfWoe: In episode 7 of season 2, [[ClingyJealousGirl Laura attacks]] Ichika with her IS bladed weapon after he says he already has a partner in mind for the upcoming tournament. [[RetiredBadass Chifuyu]] intercepts the attack, and throws her across the room. When Laura complains that her matter with Ichika is strictly between a ''husband and wife'', Chifuyu counters by saying that she would never accept a sister-in-law that acts like that. The statement hits Laura pretty hard, and she quietly sits down on the floor with a gloomy look, muttering to herself.
* CovertPervert: Rin, Cecilia, [[spoiler:Charlotte]], and Laura are shown to be this [[spoiler:in the illusions they have due to the World Purge.]]
* CreditsRunningSequence: The ending uses this as well as EvolvingCredits as [[DebutQueue each person is introduced]] it adds a new person into the ending.
* CripplingOverspecialization: Several examples:
** Ichika's IS is a close-ranged fighter, so in a ranged fight he has to dodge or absorb shots thrown at him until he can get close enough. Unless another IS user allows him to use their ranged weapons. Averted with Rin, who has a weapon that has some medium range capabilities.
** Laura's A.I.C. (Active Inertial Canceler) seems to nullify any attack thrown at her, but she has to stay focused on the attacker for it to work. So if someone else shoots her from behind...
** Cecilia's IS is designed solely for long ranged combat (eg. powerful but slow-firing long beam rifle), so if an attacker can close the distance before she can take them out, she usually seems screwed. Chifuyu also comments in one episode that she's also designed to take on multiple opponents, but in the anime at least, she only ever fights against one opponent at a time.
* CurbStompBattle: Laura easily defeats both Cecilia and Rin at the same time in her debut battle.
** Yamada-sensei does the same to those same two girls during a training fight, with a [[SoLastSeason Second-Generation]], ''Mass-production'' IS suit.
** An unknown IS named White Knight ([[spoiler:*:*cough*Chifuyu*cough*]]) took out 2,341 hacked missiles shot towards Japan 10 years ago. After the missile attack was repelled, countries from all over the world send a task force to capture or destroy White Knight; it destroys every single thing sent after it. At the end of the battle, 207 fighter jets, 7 cruisers, 5 aircraft carriers and 8 satellites were destroyed - the kicker - no loss of human life. The White Knight is a ''first generation'' IS. Heavily implied to be [[spoiler:Tabane's work, trying to convince the world that the Infinite Stratos far outguns any weapon or weapon platform then available. It works unbelievably well.]]
** The fight between Tatenashi and Autumn in episode 4 of season 2. Any setbacks the former faces was largely just her playing around with the latter, but she has the upper hand, forcing Autumn to attempt a retreat.
*** [[spoiler:Tatenashi is then on the receiving end of one in episode 9 of season 2, when she realizes that her usual attacks don't seem to be affecting the unmanned IS suits attacking the school.]]
* CustomUniform: Is understandable in Ichika's case but there's not really any excuse for the rest of the main characters.
* CutShort: The second manga adaptation by Yuuki Homura was cancelled after 8 volumes, and this was after he had taken a year off after publishing Volume 6. Some comments on his on his Twitter indicate that [[https://old.reddit.com/r/InfiniteStratos/comments/fexl78/from_the_author_of_the_current_manga_can_someone/ the manga's ending was rushed but hopefully some people would find it satisfactory.]]
* CuteLittleFangs: Lingyin's got these.
* DangerousForbiddenTechnique: The Byakku Shiki's signature attack is extremely powerful, but it comes at the cost of draining the suit's own shield energy.
** There's also the Valkyrie Trace System where [[spoiler:the IS will absorb you due to overwhelming emotions.]]
* DatePeepers: Cecilia, Lingyin and Laura tailing Ichika and [[spoiler:Charlotte]] in Episode 9. Then Laura tries to walk up and just ''ask'' what's going on, but Cecilia and Rin stop her.
* DeathByAdaptation: In the ''World Purge'' OVA, it's strongly implied that [[spoiler:the American IS pilot is killed by Maya after she opens fire with her modded-out ''Rafael'']]. However, in the novel, there was another scene that happened after the OVA's ending that wasn't animated where [[spoiler:it's revealed the pilot survived, and Chifuyu releases her and tells her to go back to her base since it isn't worth the political headache to keep her as a hostage.]]
* DefeatMeansFriendship:
** Laura is initially very hostile to everyone, particularly Ichika. But after he beats her, and saves her post-meltdown, she softens up. Sort of.
** Inverted with Cecilia, who technically won her first fight with Ichika, but grew to respect him anyway.
* DisproportionateRetribution: Poor Ichika. Looked at Cecilia's breasts accidentally? [[MegaTonPunch Get punched with an IS arm.]] Take a bath with a guy [[spoiler:who turned out to be a girl?]] Rin will go {{Yandere}} on you! Caught in an arm grapple by a naked girl who snuck into your bed? "Divine Punishment!" And later, get caught trying to kiss Houki? All the girls will now hunt you down like the dog you are. No wonder he has to act like a ChasteHero most of the time, because no matter who he chooses, he loses. He lampshades this reason of his in the manga adaptation.
* DistractedByTheSexy: All the freaking time - even his own sister invokes it. Although he acts more embarrassed by it more than anything. Taken up to eleven in episode 5 of season 2, where all of the girls are wearing {{Sexy Whatever Outfit}}s, [[spoiler:(Including Chifuyu in a maid outfit)]], and are trying to appeal themselves to him.
* DistressedDude: Ichika was kidnapped because he was the brother to the world's best IS pilot at the time, Chifuyu. And this trope is probably the reason why he was forcibly enrolled in the IS Academy, since not only is he Chifuyu's younger brother, but he's also the world's only man that can activate/pilot the IS suits. Which no doubt means every country in the world would love to have their hands on him if given the opportunity again, to learn how he managed to activate it.
** A potential [[DistressedDamsel inverted example]] with Houki. Since her sister Tabane was the creator of the IS system, the Japanese government moved her and her family around a lot to avoid anyone attempting to kidnap Houki in an attempt to force demands on Tabane. Of course, this caused a lot of strife with Houki towards her sister, as it caused her to be separated from Ichika.
* DoesThisRemindYouOfAnything:
** When Ichika's harem eavesdropping on him and Chifuyu in episode 10, accompanied by {{Sexophone}}, no less. [[spoiler:Ichika's just giving her a massage.]]
** In preparation to deal with the rogue IS, Ichika needs [[spoiler:Houki's IS' speed]] and Houki says this.
---> '''Houki''': "Although my pride would naturally prevent any man from mounting atop a woman. I'll make a special exception this time."
** In episode 10 of season 2, Ichika asks some rather suggestive sounding things to Ceciilia, while the camera pans around in a bedroom, one of which is his jacket lying on a bed. [[spoiler:Then it turns out he's just teaching her how to make rice balls.]]
* DoubleStandardAbuseFemaleOnMale: With a [[BattleHarem harem]] full of {{Clingy Jealous Girl}}s, abuse is heaped on Ichika virtually once an episode. It can get hard to watch the show at times if this trope comes to mind. However, with such a [[ObliviousToLove blockhead of a protagonist]] with picking up on matters of the heart, its also not hard to believe he deserves at least some of it.
* DramaticPause: [[spoiler:When Laura steals Ichika's FirstKiss.]]
* [[DudeShesLikeInAComa Dudette, He's Like, In A Coma!]]: [[spoiler:After the battle with the unmanned IS, Rin tries to kiss a sleeping Ichika in the infirmary, but then he wakes up, and she quickly jerks back.]]
** [[spoiler:And ''again'' just right after a half-naked Charlotte knocks Ichika out during [[AccidentalPervert a little misunderstanding between them]]. This time, it's just the forehead, though.]]
** And in the beginning of Episode 9, [[spoiler:Ichika wakes up to find that at some point during the night, Laura snuck into his room to sleep with him in his bed... ''naked''.]]
*** [[spoiler:In Laura's defense, [[NoSocialSkills her lack of social skills]], and the fact that she believes them to be "married", means that she doesn't understand the impropriety of her actions.]]
* DullEyesOfUnhappiness: Executed by both Cecilia and Rin upon [[spoiler:seeing Ichika and Charlotte holding hands as they go shopping for swimsuits]].
* {{Eagleland}}: Apparently America is to blame for the Japanese goverment handling the IS academy, President Obama much more specifically in the manga (In the relaunch manga, it was Hilary Clinton who took his place.)
** Also note, the ''Silver Gospel'' crisis is partly their fault as well [[spoiler:considering ''[[GameBreaker Silver Gospel]]'' was developed outside the IS Academy in secret, [[ScrewThisIndexIHaveTropes a clear violation of the Alaska Treaty]]. Volume 6 added icing on the cake by showing they did it again with the (much less gamebreaker) ''Fang Quake'', but still.]] Note that according to the treaty, while you are allowed to build IS units outside the academy, all testing of {{Super Prototype}}s and their gimmicks have to be inside the academy.... or else the unit/system will become a public domain design.
** The World Purge incident shows us some Flavor 2 actions by America. When [[spoiler:the IS Academy is hacked and its power sources sabotaged, America sends in the ''Fang Quake'' model & a team of special forces to raid the academy in order to steal the unregistered IS cores that Chifuyu & Maya recovered from the unmanned drone attacks. While the U.S. was not behind the hacking, the fact that they took advantage of the incident so quickly (and knew about the unregistered cores) proves that America has the academy on 24/7 surveillance (and most likely, so do many other countries).]]
* EmpathicWeapon: The IS system is adaptive and semi-"aware" of its pilot, constantly adjusting to better suit them complete with a synchronization rate and controlled by thought as much as motion. Especially so the personal IS units, which perform like generic trainer units until they've seen some use and adapt. Several suits also have powerful functions that can be triggered by the pilot's mental state. Probably the reason why self-piloting drone IS systems have long been considered impossible, lacking a pilot's guiding will.
* EroticDream: Cecilia has a pretty intense dream of Ichika about to take her virginity at the start of Volume 12... until she falls off the bed and smacks her head on the floor. Upon turning on the lights, her roommate Kisaragi Kisara gets real irritated, and she has also figured out exactly what kind of dream Cecilia was having and complains that her moaning is keeping her up at night.
* EvenTheGirlsWantHer: Nearly all the girls in Ichika's class have a crush on his sister Chifuyu.
** [[spoiler:Charlotte in a butler's outfit. Holy crap.]]
* EveryoneCanSeeIt: The girls of the harem frequently point out how they view [[IncestSubtext Chifuyu]] as their greatest rival for Ichika. The way they behave around each other normally is a big bone of contention for the rest of the harem. During the OVA, they even take notice as how the two behaved more like a married couple than siblings.
* EvolvingCredits: This trope seems to be used as quite an art form in the anime adaptation:
** During the first eight episodes of Season 1, when a girl gets added to Ichika's harem, they get added to the end credits and they join in the song.
** As the girls are added, only the most recent one is running in step with Ichika, with the others following behind them at a different pace, but beginning with episode 10 up to the second season, [[spoiler:everyone is running together in perfect sync.]]
** Houki's ribbon becomes white with a red line, instead of the usual green with black [[spoiler:during the end credits of Episode 12.]][[note]] The said ribbon was the same one Ichika gave for her birthday on the very same episode.[[/note]]
** This was also applied in the Opening sequence of Season 1, where Charlotte is seen wearing the female IS uniform after the [[UnsettlingGenderReveal Bridget Drop]].
** The ending sequence in Season 2 takes this somewhat up to eleven:
*** For the first 5 episodes, a different girl is displayed in the background with all the main characters running in unison. Additionally, another girl is added to the picture taken at the end with Ichika and his sister.
*** In episode 5, the girls are wearing the suits they had on during that episode instead of their school uniform when running; while in the Long Vacation OVA, everyone is wearing the swimsuits they used.
*** For episode 7, [[spoiler:Only Ichika and Houki]] have different outfits compared to the others [[spoiler:because of the photo shoot they participated in]].
*** At the end of episode 9, [[spoiler:Kanzashi is added to the harem. She is seen running right behind him, and her picture is used in the background. Additionally, she is in the picture taken at the end along with the other girls.]]
*** As of episode 12, [[spoiler:Tatenashi is added into the sequence, running in sync with the cast behind Kanzashi. Also, each character is shown in the background wearing civilian attire.]]
*** The ''World Purge'' OVA's ending credits have [[spoiler:each girl wearing the clothes they had on in their fantasy sequences, save for the Sarashiki Sisters[[labelnote:Note]]Kanzashi was on MissionControl duty that time, while Tatenashi held off the invading special forces[[/labelnote]]. For added fanservice bonus, Laura was wearing the NakedApron she wore at that time, and is holding it down with her left hand, thus forcing her to do a GirlyRun.]]
* EyePoke: Ichika suffers one from Charlotte in the OVA for season 2.
* EyepatchOfPower: Laura and the [[AmazonBrigade Schwarzer Hase]].
* FaceFault: Seems to happen with a fair amount of frequency.
* FallingIntoTheCockpit: Or more like walking into it. How did Ichika discover he's the first male IS pilot? He accidentally wandered into the IS Academy's exam room while looking for the exam room for the school he was going into (which happened to be adjacent to the Academy, and had a similarly pronounced name). An IS happened to be in said room.
** Chifuyu theorizes in the anime that Tabane may have engineered the whole thing. [[spoiler:Tabane denies it, and says she has no idea how he's doing it. While the exam room's IS unit was indeed rigged ahead of time to generate a response, a random, non-rigged trainer unit that was brought in for Ichika to actually use for his exam also responded, casting aside any notion that it was a mere co-incidence.]]
* {{Fanservice}}: Bits of it here and there can be seen in the beginning, and pretty full-fledge starting with episode 3.
** Heck, the entire premise was made for this. Making the IS only pilotable by women was ''not'' from the progressiveness of the writers' hearts.
** Laura Bodewig berating Ichika's ground fighting technique, while naked and holding his arm between her legs. (Nice, lengthy scene.)
** In the middle of Season 2 Episode 2, we are treated to Charlotte doing stretching exercises in her skintight IS outfit. Of course, the scene centers on [[MaleGaze her rear.]]
** Season 2 Episode 5. All of it. (The ''"why"'' can be read on the Crowning Moment of Funny page.)
** Episode 12 of Season 2 closes with an HotSpringsEpisode, full of CensorSteam (no doubt to encite the audience to buy the uncensored Blu Ray version).
** The OVA for season 2, ''World Purge Hen'', is chock full of this, with every girl getting a WishFulfillment scene with Ichika while trapped in the IS core system.
* FilmingForEasyDub: The ending of Season 2 Episode 10. What should have been a Crowning Moment of Awesome for Tabane became this because the camera kept going for close-ups on the cafe's sign outside, M's face, or other random objects in the restaurant, with Tabane speaking over these shots. Did the studio run out of cash to animate [[spoiler:Tabane disassembling the Silent Zephyrus to [[OffscreenMomentOfAwesome pieces with just her hands]]?]] It's completely averted in the DVD/Blu-ray version.
* ForcefulKiss: [[spoiler:Laura took Ichika's first kiss by shoving her tongue down his throat. While still wearing her IS armor.]]
* FreudianExcuse: Laura is a genetically engineered SuperSoldier who had undergone intense military training since birth. Naturally, this means that she has [[NoSocialSkills zero social skills]], which is why she initially comes off as a huge {{Jerkass}}.
** Cecilia's views of men as weak stem from witnessing her socially weak and inept father.
* FunbagAirbag: In episode 9 Rin runs into Orimura-sensei; the latter being quite tall and all… [[BoobsOfSteel well]].
* GeckoEnding: Even though the second season's last three episodes are adapted from volume 7, they include anime original content. The only scenes that were in the novels were [[spoiler:the first 5 minutes of & the end of episode 10 when Phantom Task tried to pressure Tabane into working for them, and even that scene was altered from the novel because of the lack of Chloe Chronicle. [[MyFriendsAndZoidberg As well as the scene in episode 11 where Laura has difficulty eating cute rabbit-shaped sweets]], but that scene occurred much earlier in the novels.]] Volumes 9 & 10, which were released 1 and 2 years after the anime's end, later cover some of the events of these episodes, but not all. The author himself even admitted in Volume 10's afterword that he treats the two as separate continuities, as "the things that happened in the anime happened in the anime, the things that happened in the books happened in the books."
* GenderReveal: [[spoiler:Ichika discovers Charlotte is a girl when he [[ShowerOfAwkward walks on her in the shower]]. She has a NakedFreakOut and tries [[HandOrObjectUnderwear cover herself with her hands]] while he's [[DeerInTheHeadlights frozen with shock]].]]
* GetAHoldOfYourselfMan:
** Houki gives one to Ichika for trying to charge recklessly towards Laura's VT-enabled IS.
** Rin gives Houki a good slap [[HeroicBSOD after she blames herself for Ichika getting hurt]].
* GirlyRun: In the ending theme, Cecilia and [[spoiler:Charlotte]] seem to run like this.
** In Season 2, when [[spoiler:Kanzashi]] joins the harem, she runs like that too.
* GossipEvolution: What originally was "Ichika agreeing to date Houki if she becomes tourney champion" one evening becomes "Ichika agreeing to date anyone who becomes tourney champion" the next morning. All thanks to [[ThoseTwoGuys three certain girls]], of course.
* GratuitousForeignLanguage: The original sub only has a few minor instances of GratuitousEnglish (such as the name Infinite Stratos itself). The dub, however, gives Charlotte and Laura thick French and German accents, respectively, and they pepper their speech with [[GratuitousFrench French]] and [[GratuitousGerman German]].
** GratuitousEnglish: Chifuyu in the season 2 episode previews uses this when announcing the title of the next episode. It's actually pretty hilarious considering how seriously she says it each time. Then again, Creator/MegumiToyoguchi is no stranger to [[Manga/BlackLagoon Engrish]]...
* GunsVsSwords: Cecilia vs. Ichika. Cecilia wins because Ichika's sword drains his shield energy with every attack and his shields ran out seconds before he won.
* {{Gunslinger}}: Cecilia and Charlotte.
* HappyEndingMassage:
** Cecilia gets massaged by Ichika twice. The first one made her orgasm with him none the wiser.
** Tatenashi in season 2 has heard about these and demands that Ichika give her one too in episode 3. However she asks him while he's using the bathroom, and it turns into SeriousBusiness when she uses her IS weapon to break the door down after he attempts to barricade himself in there. He finally relents and gives her one much to her delight.
* HelmetsAreHardlyHeroic: The members of Phantom Task who have their own IS Suits (Madoka, Autumn, Squall) have full-face helmets when piloting their suits. The protagonists... don't.
* HeroTrackingFailure:
** Many shots fired at the main characters by their opponents, though flashy, often miss.
** Tatenashi manages to evade gunfire without her IS suit in the season 2 OVA. Unfortunately her PlotArmor wears off shortly afterwards and she's hit by one bullet.
* HeroicBSOD: Houki goes through a brief one in episode 11 after Ichika loses consciousness while protecting her from one of Silvario Gospel's attacks.
* HighPressureBlood:
** [[spoiler:Happens to Tatenashi in episode 9 of season 2, after she shields her sister Kanzashi from an attack by an unmanned IS suit.]]
** Tatenashi suffers one in the ''World Purge'' OVA after realizing that the hacker was actually a third party independent of the Americans attempting to steal the school's IS core. [[spoiler:She is then shot by one of the soldiers she knocked down earlier, who manages to fire a pistol at her. Quite a bit of blood then spurts out.]]
* HighSpeedMissileDodge: Pulled off and [[SubvertedTrope subverted]]. Ichika still takes a hit from Cecilia's missiles... and survives.
* HistoricalInJoke: Charlotte and Laura's relationship is similar to the relationship of France and Germany, who at first were at odds with each other, until they became friends through the Franco-German Friendship after UsefulNotes/WorldWarII.
* HotSpringsEpisode: Ichika and Charles, er, Charlotte, get one together in episode 8. Nobody thinks much of it at the time, until Charlotte [[TheReveal comes out of her shell]] the next day, causing a big ruckus.
* HotTeacher: Chifuyu. Oh yes. Her own brother regularly compares her figure as being better than most models... Much to her chagrin.
* HotterAndSexier: The series' second manga adaptation, where it seems like every girl has gotten a boob job ([[RunningGag except Rin]], [[ACupAngst who still looks the same]]) and strike poses that accentuate their figures. The mangaka of the second adaptation is [[BleachedUnderpants Yuuki Homura.]] Those that know the artist wouldn't be surprised if Chifuyu got special treatment as he favors well endowed big sisters.
** The very ''first page'' of the reboot manga is Houki [[ShowerScene taking a shower]], with only CensorSteam covering up her breasts.
* HowWeGotHere: The first part of episode one depicts a battle between Ichika and his team versus the unknown IS machine. The rest of the season depicts the events leading to that scene. The same is true for the second season.
* ImpaledWithExtremePrejudice: Tatenashi in episode 4 of season 2. But it turns out to have been a fake that she manipulated using nanobots. [[spoiler:Played straight in episode 9 of season 2, when she shields her sister from an attack with her own body. She barely survives it and is taken to the hospital after the attack by the unmanned IS suits is stopped.]]
* ImprobablyFemaleCast: Although justified In-universe. The IS system can only be used by women normally, but Ichika is somehow able to activate it as well. Even Tabane, the IS suit creator, is unsure of how he's able to do it. As a result, Chifuyu transfers him to the all-girls school to learn IS combat, partly so he can learn to use his IS suit better, and largely to keep an eye on him, lest some unscrupulous country or organization gets their hand on him again.
* IncestSubtext: Charlotte accuses Ichika of this when she sees his reaction to Chifuyu in a skimpy swimsuit, but [[HotTeacher who could blame him anyway]]? The catch, which wasn't show in the anime, is that ''Chifuyu'' asked ''him'' which one he'd prefer between a white sporty one and the black one that she ended up getting. He inadvertently picks it by glancing at it first, which she took as his first choice.
** Picking out her wardrobe is nothing new - he does it all the time for her and she wears his choices with no complaint. She'll even go a bit out of her way to grab/wear the ones that ''he'' likes more.
** Given what they overheard coming from their shared room in Episode 10...
** Also from Episode 10, the conversation that Chifuyu and the 5 girls have heavily implies that she has challenged them to "try and get to my level". And she doesn't mean in IS piloting skill. In the OVA, there was the little bit of her coming home to the house and Ichika greeting her like a housewife. She notes this to Yamada, saying; "On that field trip, I told those five girls I wouldn't let them have Ichika. I didn't think much of it or put any deep meaning into it, but it seems the girls think that I'm a rival now."
** Then there's Ichika's birthday, in which every member of the harem decides to cosplay for him. Chifuyu ends up being the main event, dressing as a maid for him and actual spoon feeds him [[note]]Again, something the rest of the harem have repeatedly tried to do with no success.[[/note]]. When Ichika is asked who's performance was his favorite, he chooses Chifuyu without a second thought.
* InformedAbility: In the anime, it's mentioned that Byakku Shiki is quite possibly the most powerful IS in the school, if not the world. However, Ichika so far has not been able to defeat an enemy (or at least has extreme trouble in doing so) in a straight up one-on-one fight.
** The Byakku Shiki is considered powerful due to it's ''only'' weapon: a sword that '''one-hit-KO's opponents'''. This, coupled together with its insane maneuverability and speed, makes it extremely formidable. The problem comes from the fact that said assets also rapidly drain the shield energy of the IS. Basically, it has a lot of raw power and speed, but very little endurance.
** There's also the matter of the pilot, who is still very much behind everyone else in both formal and informal training (being that no men before him piloted an IS, that's justified). This discrepancy shows very well in Ichika's first battle with Cecilia; he's completely untrained, flying an IS for the second time in his life - a close-range type he's wholly unfamiliar with. She's practically a professional considering her age, and fights in a long-range model. He lasts over thirty minutes, figures out a tactic that could potentially beat his opponent, and ''then'' his IS enters First Shift - i.e., he kept up with her while overwhelmingly outgunned, outprepared and outmatched in every way on the equivalent of the lowest power setting Byakushiki has. And then comes within a hair's breadth of winning. No wonder Cecilia breaks down after this and falls for him; had they been on an even level in mere training, [[CurbStompBattle she wouldn't have lasted five minutes]] against him.
* InformedAttribute: The novels remind the reader over and over '' and over'' again that ever since the introduction of the ''Infinite Stratos'' suits, society has changed so that women are the dominant gender in everyday life, so much so that if a man on the street were to suddenly be ordered by a woman to do some ridiculous task (like suddenly shining her shoes for no reason), it wouldn't be unusual. But we never see any examples of this kind of thing happening. The anime & manga adaptations don't even bring up this issue. The majority of the novels' contents are written from Ichika's point of view, which means this could be UnreliableNarrator, but there are a few times when even the third-person narration brings up this point, such as when three bank robbers attacked the maid cafe in Volume 4 Chapter 2 [[labelnote:*]]The corresponding anime episode is Season 2 Episode 1[[/labelnote]] in which the narration describes these men as being either extremely brave or extremely foolish to pull this kind of stunt in a world dominated by women.
** Volume 7 finally shows some evidence of this when Ichika is denied entrance to a fancy restaurant because he lacks a tuxedo. Ichika has to buy a tuxedo from a shop in the same building, no other options. While there is a similar dress code for females, they are at least allowed the opportunity to ''rent'' a dress.
* InstantArmor: Most IS users can summon part or all of their at any given moment. Implied to be nano-technology or matter teleportation; how or why is never precisely explained. Counts as [[AppliedPhlebotinum applied phlebotinum]]
* InvisibilityCloak: The American military force that attacks the Academy in the World Purge OVA had this, but they were detected by ''Mysterious Lady.''
* {{Irony}}: The ''Fang Quake'' IS that the American military uses in the novels is based off of Rin's ''Shenlong''. America is copying a Chinese design.
* KickingAssInAllHerFinery: In Season 2 Episode 3, the girls are dressed as Cinderella (complete with PimpedOutDress), and the first to grab the crown off of "Prince" Ichika's head will win the right to be his roommate. As you might expect, they come to blows about this, particularly Houki (with her katana) vs. Laura (with her knives), and it is ''awesome''.
* LapPillow: Tatenashi does this for Ichika in episode 2 of season 2 after she knocks him out moments earlier. Laura walks in on them, and promptly attacks him with her IS blade, although Tatenashi deflects it with an iron fan.
* LastEpisodeNewCharacter: [[spoiler:The last few scenes of Season 2 Episode 12 show Tabane conversing with Chloe Chronicle, the person responsible in the Light Novels for the [[LotusEaterMachine World Purge Incident]]. It's possible that she would appear in the [[http://www.animenewsnetwork.com/news/2013-12-19/infinite-stratos-light-novels-get-ova-in-2014 third OVA]].]]
* LeeroyJenkins: Laura initially, and Houki at first when she gets her personal IS. Ichika is sometimes forced to utilize this trope since his only default weapon is a sword.
* LeftHanging: [[spoiler:Ichika's fate at the end of Volume 6 of the LightNovel.]] [[spoiler:Laura saves him from the gunshot.]]
** The strange visions Ichika sees in the final episodes of both seasons. There has been absolutely no explanation for these. Doubly so for the second vision because it wasn't in the novels; at least the anime remembered it but it's still a MindScrew.
* LeotardOfPower: Female IS pilot uniforms complete with ZettaiRyouiki.
* LethalChef: Cecilia. This really comes to the fore in Season 2 Episode 10. She decides that the fried chicken Houki is teaching her to make could be "more colorful", so what does she do? Spray perfume on it, and then slather it in hot mustard. Houki then eats a piece...and becomes violently ill. As do Charlotte and Laura.
* LetsGetDangerous: Episode 5 has Yamada-sensei sweeping the floor against both Lin and Cecilia at the same time.
* LightningGlare:
** Houki vs Cecilia vs Lingyin in Episode 5 of season 1.
** Lingyin does this with Charlotte in episode 7 of season 2.
* LimitBreak: An IS' One-Off ability.
* LotusEaterMachine: [[spoiler:Houki, Cecilia, Charlotte, Laura and Rin mentally enter the security system of the IS Academy after it is hacked, and are trapped inside of the World Purge program by Chloe Chronicle so Chloe can activate Chifuyu's IS, Kurozakura.]]
* LoveConfession:
** Houki gives one to Ichika in the 2nd half of the OVA of the first season, but he doesn't hear it because fireworks go off at the same time she says it.
** Kanzashi gives one to Ichika at the end of episode 9 in season 2 and runs away afterwards. Unfortunately for her, when she thinks about it, she realizes she accidentally told him she likes anime instead, because he asked her that just before she said she "liked it" and ran off.
* {{Luminescent|Blush}} CrushBlush: A lot of characters in the anime adaptation (particularly the main female cast) exhibit this when around Ichika. Even Ichika himself is not that immune to this kind of blushing.
* MadeOfIron: Let's be honest, considering all the damage Ichika keeps taking, it is impressive he barely suffers any long-term consequences.
* MakeItLookLikeAnAccident: [[spoiler:The introduction of Cecilia's maid, Chelsea Blanchett, also revealed the truth about the train accident that killed Cecilia's parents. In short, it was no accident, but rather a cover-up of the '''assassination''' of her parents, carried out on orders by someone very high up in the British government, because they found out that the Alcotts had somehow, via illicit means, obtained an [=IS=] core to power some sort of construct that's keeping Chelsea's little sister alive.]]
* MaleGaze:
** Plenty already starting from episode 1 of the anime, as Ichika is the [[TheOneGuy only important male character]]. Also during the few TransformationSequence we see, there seems to be a bit of focus on the girl's bosoms, or their waists.
** In the Yuuki Homura manga adaptation, he finds himself checking out Houki's rear and berates himself for it. That particular scene wasn't present in the novels, the anime, or the first manga, leading some readers to joke that at least in this continuity, Ichika finally has a sex drive.
* MassOhCrap:
** Ichika's class is utterly shocked when Charlotte reveals her true identity and Laura does a WackyMarriageProposal to Ichika after giving him a ForcefulKiss.
** The girls after Rin accidentally kicks Chifuyu in the season 2 OVA
* MegatonPunch: Ichika and Dan Gotanda are often on the receiving end of these.
** A notable instance is on the beach, when Cecilia gets fed up with Rin rubbing suntan oil on her sensitive parts and stands up. Her untied bikini top is left on the towel, and Ichika is innocently staring right at them. He gets a literal MegatonPunch from Cecilia's IS arm.
* MomentKiller:
** [[spoiler:By the end of season 1, Houki finally confessed to Ichika and he's about to kiss her when the rest of his harem show up in their IS Suits in anger with the intent to "punish" him.]]
** Rin and Ichika's moment in the season 2 OVA gets interrupted by Kanzashi, who tells the former to get out of the system so he can go rescue the other girls.
* MoodWhiplash: Episode 5 of season 2. Ichika is walking back to the dorms after having a surprise birthday party thrown for him, [[spoiler:only to then run into Madoka, who pulls out a gun and shoots as the episode ends.]]
** Episode 11 as well. The first 3/4 are nothing but random harem comedy as all the first-year students go on a field trip. The first warning we get that the mood is about to change is when [[BigBad Squall]] appears and offers to take a picture of Ichika & Houki together. We get more comedy afterward as all the girls try to see what pictures are on Ichika's camera, to the point that he accidentally drops it off a cliff while being mobbed. Then in the last few minutes of the episode, [[spoiler:Madoka appears again to kill Ichika with her [[MidSeasonUpgrade new IS "Black Knight"]], Autumn ambushes Houki & Cecilia in her IS, the train that Chifuyu, Maya, & all the other students are on is hacked and hijacked, and Tatenashi is about to throw down with Squall on top of a tower.]]
* MoreDakka / BeamSpam: The ''Silver Gospel'' loves this.
** Yamada has four huge gatling guns which she uses on an attacker in the OVA for season 2.
* MouthfulOfPi: Ichika forces himself to recite Pi as a means to avert [[DistractedByTheSexy thinking naughty thoughts]] about Charlotte as she's changing in the same changing room that she dragged him into.
* MultinationalTeam:
** Ichika and Houki are Japanese, Cecilia is British, Rin is Chinese, Charlotte is French, and Laura is German. The light novels introduced an American pilot, Natasha Fairs, but she's not part of the harem and only appears in two scenes.
** Season 2 introduces Tatenashi Sarashiki, the IS representative for Russia. Her sister Kanzashi is the rep for Japan.
* MythArc: Starting with the second season: What is Phantom Task up to? And [[spoiler:who is Madoka Orimura?]]
** Another one that has spanned the entire series: who keeps sending unmanned IS drones to attack the Academy?
*** Eventually revealed to be [[spoiler:Tabane. The light novels clarify that she uses the ''Golems'' to gather real life battle data from Houki.]]
** Why is Ichika the only male who can use an IS? Or rather, this feels like it ''should'' be a MythArc, [[SubvertedTrope but no one really dwells on it.]]
[[/folder]]
[[folder:N - Z]]
* NakedApron: Laura wears one in the season 2 OVA ''World Purge''. [[spoiler:And in the ending credits, she's still wearing it, and while running, attempts to hold the apron down to prevent it from revealing her body too much.]]
* NakedFirstImpression: {{Downplayed|Trope}}. Ichika {{accidental|Pervert}}ly catches Houki wearing only a ModestyTowel after he walks into their shared dorm room for the first time, which starts off their relationship in the wrong foot.
* NamedWeapon:
** Apart from the IS units having their own names, their weapons are named as well. A proper example would be the Yukihira Type-2 for Ichika's ''Byakkushiki'' - also at the time of its introduction, his only equipped weapon.
** Outside of her ''Akatsubaki'', Houki owns a sword named Akeyou, as revealed in Volume 2.
* NewTransferStudent: Ichika, followed by [[ChildhoodMarriagePromise Rin]], [[HoYay Charles]], [[AxCrazy Laura]] and finally Charles as his... er, ''[[UnsettlingGenderReveal her]]'' authentic self, Charlotte.
* NippleAndDimed: Averted in the Blu-Rays, in all their uncensored glory.
* NoEndorHolocaust: While relaxing in the bar in the series' final episode, Maya mentions to Chifuyu that there were "zero casualties" from the big battle against Phantom Task. That's... pretty impressive considering entire city blocks were getting blown up by Madoka's GameBreaker of a suit, not to mention Squall deploying a SphereOfDestruction too.
* NoHoldsBarredBeatdown: Laura delivers such a mean-spirited thrashing to Cecilia and Rin in Episode 7 that the damage sustained by their IS made them unable to participate in the actual school tournament.
* NoRomanticResolution: In the anime at least, none of the girls hook up with Ichika at the end. Houki does seem to have a significant lead over them in the second half of the season 1 OVA, but [[ObliviousToLove Ichika]] gets [[MomentKiller distracted by some fireworks.]]
* NoSell: Cecilia and Laura fire some big shots in episode 12 of season 2 at Madoka. Despite the large explosion, the latter emerges unscathed from the attacks.
* NoSocialSkills: Laura to the hilt. First she calls Ichika her ''bride'' after kissing him on the lips in the classroom; she sneaks on to his bed one night ''[[SleepsInTheNude naked]]''; and then in the 4th book, [[spoiler:she licks the cream from a crepe off of Charlotte's ''lips'', to Charlotte's chagrin.]]
* NonUniformUniform: Rin has detached sleeves on her uniform, Cecilia has a knee-length dress in the style of the uniform, Laura forgoes the skirt/dress altogether, opting for pants and boots, and of course Ichika's uniform is completely different from everybody else due to being the only guy in the academy.
* NotWhatItLooksLike: Ichika is often in these predicaments, but it generally doesn't stop him from getting beat up by the girls, such as when Houki finds him being held against his will in his bed by a naked Laura in episode 9 of the first season.
* OccidentalOtaku: The vice-captain of the [[AmazonBrigade Schwarzer Hase]], Clarissa Harfouch, who regularly gives Laura advice on Japanese culture and pursuing Ichika based on manga and anime.
* OffscreenMomentOfAwesome: One happens during the end of episode 10 in season 2, [[spoiler:when Tabane is surrounded by three Phantom Task members. One tried to [[TamperingWithFoodAndDrink spike her soup with a sleeping drug]], another [[ClickHello put a gun to her head]], and Madoka [[DynamicEntry crashed through the restaurant wall in her IS suit.]] Tabane [[CrouchingMoronHiddenBadass effortlessly subdues]] all three of them with little more than a few swift kicks, a butter knife, and a fork.]]
* OrbitalShot: When Cecilia and Ichika duke it out in Episode 2.
* ParentalAbandonment: If you are a main cast of this show, it is a must that you don't have any parents present with you. To wit:
** Ichika and Chifuyu's parents abandoned them, leading Chifuyu to [[PromotionToParent raise Ichika by herself.]] And then there is the little detail that Ichika doesn't have baby photos at all.
** Houki's entire family had to constantly move around due to her older sister Tabane introducing the IS system, and thus needs protection, causing Houki to hate Tabane for it.
** Lingyin's parents divorced due to differences and the restaurant that Ichika used to visit has closed.
** Cecilia's parents died from a train accident, forcing her to protect her family's treasure from pretenders by herself.
** Charlotte is the [[HeroicBastard illegitimate child of a (now-deceased) country woman]] and the CEO of the French IS company who abandoned him[=/=].
** Laura's a genetically enhanced SuperSoldier and was raised in a military environment, and thus had no parents.
* PatientChildhoodLoveInterest: Two of them in Houki and Rin. Funnily enough, though, they never met each other until the series started; Houki moved away from Ichika when they were six years old, and Rin moved into the same neighborhood when he was seven.
* PiggybackCute: Ichika carries Houki on his back after the photoshoot in season 2 episode 7. In the novel version of this scene it was a BridalCarry.
* PlotBasedVoiceCancellation: Houki gives a LoveConfession to Ichika in the second OVA episode, but she says it just as fireworks go off in the distance, which distracts Ichika long enough that he doesn't hear it.
* ThePowerOfLove: Chifuyu and Ichika both claim that their skill comes from protecting others. [[spoiler:Laura]] decides that if she wants to be stronger, she needs to follow their example.
* PoweredArmor: The IS qualify, being mecha-suits made of nanomachines.
* ThePromise: Ichika, being the clueless harem hero, misinterprets his [[ThroughHisStomach promise]] with Rin and prompts another angry duel.
* PunchedAcrossTheRoom:
** Rin does this to Ichika after he hastily opens her door, to find her wearing just a bikini top and short shorts.
** A more serious example occurs in episode 9 of season 2, when an unmanned IS suit throws him into Kanzashi after the latter is frozen in fear.
* RedAndBlackAndEvilAllOver: Laura's IS is also this color scheme, possibly as a ShoutOut to Elzam, as the series likes to reference other mecha anime. And she does a HeelFaceTurn as well (Sort of).
* SchizoTech: While the date for the series is never given, the Manga and the Anime specifically show President Obama as the main driving force behind IS Academy and the Alaska Treaty, placing the unveiling of the IS somewhere between 2009 to 2016. Considering that the IS is an artificial intelligence embedded into what seems to be a fusion reactor or zero-point energy source roughly the size of a baseball or smaller...yeah, you get the picture. Granted, Shinonono Tabane is rumored to be a genius who makes '''Einstein''' look dumb.
* SchmuckBait:
** In Episode 10, Ichika comes across Houki staring at a sign behind two metal flaps which says "Please pull them out." She doesn't. [[IdiotHero Ichika can't resist]]. Though, given the little carrot on the sign (and the very shape of the trap itself) made it quite obvious who was behind the trap, Ichika probably thought something along the lines of 'The sooner, the better'. After all, none of them seemed too happy about seeing Tabane.
** In episode 10 of season 2, Ichika complains about being chosen to measure the girl's bodies. Yamada-sensei simply says that's what the StudentCouncilPresident [[ScrewTheRulesIMakeThem Tatentashi wanted]]. Chifuyu gives him a blindfold to use, but unfortunately, it's a see-through, so it doesn't block his view much. One wonders why he didn't just ask Yamada-sensei, who was recording the measurements, to switch jobs, particularly after his UnwantedHarem find out he's measuring the other girls.
* ScrewTheRulesIHaveConnections: Apparently (in the manga at least) Lingyin was able to enroll in the IS academy despite not taking the entrance exams by begging her uncle, a high-ranking officer in the Chinese military, to pull some strings for her.
* SeizaSquirm: Happens to Cecilia in episode 10.
* SenseiChan: Yamada-sensei.
* SeriousBusiness: In episode 3 of season 2, Ichika is asked to take part in a play. He's told what he'll have to do as things occur on the play, and the play turns out to be a variation of Cinderella. Except that it's a group of elite assassins, consisting of the main girls in the show, most of whom attack him with full force, demanding the crown he's wearing in the process. [[spoiler:In a short FlashBack, the student council president told them whoever could get his crown would get to be Ichika's roommate. She also apparently told many of the other girls at the school, as a short while later they all take part as well. She also never told Ichika about this, and shocks him when he tries to just give the crown to Charlotte, hence his confusion as to why the girls want it so badly.]]
* SexyWhateverOutfit: The girls wore animal-themed outfits in season 2 episode 5, in a "secret battle to please Ichika". Cue bits of supposed DistractedByTheSexy and heaploads of MaleGaze.
* ShoutOut: Some of the IS suits including their weapons, coloration, and names are a shout out to various mecha anime, particularly to the Franchise/{{Gundam}} and ''VideoGame/SuperRobotWars'' franchises:
** Ichika's ''Byakushiki'' (Type-White) is this to a white re-painted version of Char's [[Anime/MobileSuitZetaGundam Hyakushiki]] (Type-100) that appeared in ''[[Anime/ModelSuitGunplaBuildersBeginningG Mobile Suit Gunpla Builders Beginning G]]''. It so happens that said [[[[http://www.mahq.net/mecha/gundam/gunpla/msn-00100-gpb.htm repaint]] shares the same name.
*** His MidSeasonUpgrade ''Setsura'' is also this, but to the [[Anime/MobileSuitGundamSEEDDestiny Destiny Gundam]].
** Houki's ''Aka Tsubaki'' draws a lot of parallels from [[LawOfChromaticSuperiority red mobile suits]], particularly the [[Anime/MobileSuitGundamSEED Aegis (Shape and Color Scheme)]] and [[Anime/MobileSuitGundam00 Arche (The feet-mounted beam blades)]] Gundams.
** Cecilia's ''Blue Tears'' (Particularly the {{Attack Drone}}s and the hip-mounted weapons) is a clear reference to the [[Anime/MobileSuitGundamSeedDestiny Strike Freedom]].
** Rin's ''Shenlong'' was named from [[Anime/MobileSuitGundamWing an After Colony-era Gundam of the same name.]]
*** Supposedly inverted in the ''Glory of Losers'' manga reboot, where the ''[[http://images.wikia.com/gundam/images/5/58/Up84836.jpg Laoiya]]'' sword add-on to the same Gundam shares a similar silhouette to the ''Souten Gagetsu''.
** Charlotte's ''Rafale Revive Custom II'' is not just an AceCustom variant piloted by a CharClone. [[https://www.youtube.com/watch?v=5T0-SyZmLqY Thanks to that Pile Bunker attack on Laura,]] it is also an [[VideoGame/SuperRobotWarsCompact2 Alt Eisen expy]].
** Laura's ''Schwarzer Regen'' is primarily black with red and yellow/gold trim. Wonder why she [[VideoGame/SuperRobotWarsOriginalGeneration hadn't overridden anyone's theme song yet]].
** In episode seven, there's a list of representatives who are going to watch the tournament. [[http://i55.tinypic.com/28ti4g9.jpg One of them]] is [[Series/TheOfficeUS Michael Scott]].
*** In episode 8, it looks like Michael [[http://oi54.tinypic.com/21l61pi.jpg chose to attend after all]].
** Episode 9 is called Film/OceansEleven
** Episode 10 is called Film/TheThinRedLine.
** In episode 11, Houki and Ichika's OutOfClothesExperience wouldn't be much of a ShoutOut by itself, unless you watched the third episode of ''[[Anime/MobileSuitGundamUnicorn Gundam Unicorn]]'' and realize that Ichika and Banagher [[ActorAllusion have the same seiyuu.]]
** The preview of episode 12 has a similar thing that happens with Anime/NeonGenesisEvangelion. All it lacks is [[GainaxEnding the "Congratulations" scene.]]
** The [[http://baka-tsuki.org/project/index.php?title=File:IS_v08_004-005.jpg ultra-cool battle suit and the half dozen katanas]] Chifuyu uses in the World Purge OVA to fight the ''Fang Quake'' IS. She's practically a female version of [[VideoGame/MetalGearRisingRevengeance Jetstream Sam.]]
* ShowerOfAwkward: [[spoiler:How Ichika finds out Charlotte's true gender.]]
* TheSmurfettePrinciple: Inverted. There are very few male characters in this series. Besides Ichika, there is his middle school buddy Dan who gets maybe a grand total of 2 minutes screentime in an entire season (he appears a bit more frequently in the novels), the robbers in the 2nd season's first episode, and a few flashbacks of some characters' fathers.
* SpellMyNameWithAnS: There seems to be a disparity with some characters' last names. Rin's name causes issues depending on whether you're romanizing from the Chinese or Japanese pronunciation, and with the former, depending on what dialect you're doing. Just look at how many times her name is used interchangeably on this very page as either "Rin" or "Ling(yin)." The J-Novel Club official translation specifically has only Ichika refer to her as "Rin" and uses "Ling" in all other instances.
** Charlotte's surname also causes issues. It's written as "Dunois", but read as "Dunoa" (which is also close to the correct French pronounciation, which would be "doo-nwah").
** Another example would be the joint US/Israeli IS unit that caused a ruckus over the skies of Japan. While it's written as "Silver Gospel", plus having its kanji title be a direct translation of that, the "Silver" part is always read as the very [[GratuitousSpanish Spanified]] "Silverio".
* SpiderSense: In the ''World Purge'' OVA, Ichika senses that something is wrong and that he's needed back at the Academy while his IS suit is getting repaired. [[spoiler:This happens right after Tatenashi gets shot, and calls his name out.]]
* StayInTheKitchen: Possibly {{gender flip}}ped. The revolutionary IS suits, having made most other weapons obsolete, can only be piloted by women, which kinda leaves the men in a bad place, combat-wise.
* {{Stripperiffic}}: An excellent example of Stripperiffic PoweredArmor.
* SuperPrototype: [[spoiler:Ichika's Byakku Shiki is actually a 4th Generation Prototype. However, as a testbed for new technology and concepts, its full of flaws making it more of a FlawedPrototype.]]
* SuspiciouslySpecificDenial: In season 2 [[spoiler:after Ichika survives Madoka's assassination attempt on him, he runs into Chifuyu and point-blank asks her if they have a sibling named Orimura Madoka. Chifuyu answers with, "you're my only family" and walks away. Which, you may notice, [[NonAnswer does not answer Ichika's question]].]]
* TakingTheBullet: Well, it was a sword attack, but [[spoiler:Tatenashi takes the blow for her sister Kanzashi in episode 9 of season 2 when the latter is standing helpless while watching Ichika get thrown around by the unmanned IS suits.]]
* TakingYouWithMe: Tatenashi attempts this with the unmanned IS suit attacking her and Houki in episode 9 of season 2. A big explosion follows her attack, [[spoiler:but it fails to stop the suit, and Tatenashi is lying in the rubble.]]
* TalkingIsAFreeAction:
** Happens with Ichika and Houki in episode 11 of the first season.
** Occurs again in episode 9 of season 2, this time with Kanzashi, Tatenashi, and Ichika.
* TechnologyPorn: The series is loaded with this trope.
** [[spoiler:Houki's MidSeasonUpgrade, Aka Tsubaki, utilizes all the technology in the Byakku Shiki after all of its flaws had been corrected, making it the true 4th Generation SuperPrototype.]]
* ThanksForTheMammary:
** When a shaky entry by Yamada-sensei in her IS results in crash landing on top of Ichika, after the dust clears he finds himself ''on top of her with his hand on one of her boobs.'' Unlike most girls, she doesn't react violently to it, and instead hints something about becoming Chifuyu's 'sister-in-law' loud enough for the other girls to overhear.
** Tatenashi does this to Houki in episode 8 of season 2.
* TheyCallMeMisterTibbs: Chifuyu [[strike:prefers]] DEMANDS the students to call her Orimura-sensei. Those who don't will get whacked with her attendance book. Even her brother. ''Especially'' her brother.
* TheThingThatGoesDoink: Appears as a background prop of sorts in [[BirthdayEpisode season 2 episode 5]].
* ThinkUnsexyThoughts: Ichika is forced to do this after Charlotte drags him into a changing room. He does it largely by reciting Pi. All the while still imagining Charlotte's figure.
* ThrowingYourSwordAlwaysWorks: Subverted. Rin does this in episode 3 of season 2 during the Cinderella play, but Ichika blocks with Charlotte's riot shield at the last minute. While it does prevent the sword from hitting him or Charlotte, it also shatters the shield.
* TournamentArc: Played with, almost to the point of a running gag. Every time a tournament begins, Ichika always ends up fighting against the respective arc opponent(s) in the very first round, of the very first match, and something always goes wrong in said match that ends up getting the entire tournament cancelled.
* TransformationTrinket: The IS, sort of. The Season 2 opening theme highlights it: Houki's wrist-charms, Cecelia's earrings, Rin's bangles, Charlotte's necklace, Laura's thigh-holster, and Ichika's wristband can all transform into their respective IS Suits.
* {{Tsundere}}: Houki, a clear Type B. Possibly justified by [[ObliviousToLove Ichika's personality]].
** Cecilia after her battle with Ichika.
** Most of the female characters actually fit this. Charlotte may be the only one who averts this.
* TwoTeacherSchool: Chifuyu and Maya are the only two teachers who get a decent amount of screentime for the teachers. Although other teachers are referenced, these two are the only ones that are seen regularly for the faculty at the school.
** There was Canadian math teacher Edwards Franchee from the novels, seen in Volume 7 Chapter 3.
* UnsettlingGenderReveal: Charlotte to Ichika on Episode 5, and three episodes later, to the entire class via Yamada-sensei. Obviously some girls (''especially'' [[{{Yandere}} Lingyin]]) didn't take the implications well, especially considering it was known to everyone that she (as Charles) shared the public bath with Ichika the previous day.
* UnwantedAssistance: When Houki, Rin, and Cecilia all try to explain to Ichika how to use the IS with their {{Technobabble}}, it only serves to confuse him. On the other hand, Charles offers to duel Ichika, and after soundly [[CurbStompBattle stomping him]], he offers some tips on Ichika's weaknesses and explains things that makes it easy for him to understand. He also helps train Ichika on using a rifle, and seems a bit too friendly, causing the girls to get quite [[ClingyJealousGirl jealous]].
* UnwantedHarem: The premise of the show, if you don't count the PoweredArmor.
** An interesting scene occurs at the beginning of episode 10 in season 2, [[spoiler:after Kanzashi joins the harem. All of the other girls are sitting around her, and grilling her with rumors of her dating Ichika. Charlotte seems to calm them down briefly and offers Kanzashi a drink, [[BewareTheNiceOnes only to then ask the same question]], while also having a {{Yandere}} look, until the poor girl clears up the misunderstanding, which calms them all down when they realize he's not dating anyone...yet...]]
* VillainousRescue: Ichika in episode 3 of season 2, runs away from a gaggle of girls chasing him during the play. [[spoiler:He's saved by the lady who wanted to put her business's attachments onto his IS suit when she hides him underground. However, she's developed an AxCrazy look on her face, and at this point simply demands his suit.]]
* [[ViolentlyProtectiveGirlfriend Violently Protective Harem]]: Why else would they go after the rogue IS despite being told to standby?
* WackyMarriageProposal: [[spoiler:After she's done shoving her tongue down his throat, Laura claims Ichika as her ''wife'' in front of their entire class and the rest of Ichika's harem.]]
* WhamLine: At the end of episode 8 in season 2, Kanzashi reluctantly accepts Ichika as her partner for the upcoming tournament. He also enlists the help of several other girls to fix the problems in her IS suit to get it working. She is later seen carrying some muffins to his room, [[spoiler:only to stop when she sees her sister Tatenashi leaving his room, and asking if the plans she gave him for fixing up Kanzashi's suit helped. Kanzashi runs away and cries in her room after finding out that her sister used Ichika to help with her suit, when up to that point she had adamantly refused any help from her.]]
* WhatBeautifulEyes: Ichika tells Laura this. Interesting in that this is also the first time Ichika is able to get a good look at both of her eyes at once up close (Laura had removed her eyepatch to deploy her [[DeflectorShields Active Inertia Canceller]]). The first time it happened in the first season, there was [[SuperpowerMeltdown too much going on for him to focus on it.]]
-->'''Ichika''': They look like gemstones...\\
'''Laura''': ''[[[LuminescentBlush blushing intensely]], to herself]'' Beautiful...Ichika said that I look beautiful...
* WhatIsThisThingYouCallLove: Laura falls in love with Ichika after he saves her life. However, growing up in a strict military academy left her with NoSocialSkills, and she has no idea of how to properly express these feelings.
* WhatTheHellHero:
** Laura, Cecilia, and Rin attacks Ichika rather forcefully during the play he's been asked to take part in during episode 3 of season 2. See the entry for SeriousBusiness for further details.
** To a lesser degree, anytime one girl tries to do something with Ichika by herself, and either he invites the other girls, or more likely, the others tag along after spying on them.
* WhenAllYouHaveIsAHammer: It turn out the worlds' best IS pilot uses only one blade and nothing else.
* WireDilemma: In Volume 5, Ichika and Dan participate in one. Ichika proceeds to cut the wires leaving with Red (Houki/Akatsubaki) and Blue (Cecilia/Blue Tears). Ichika then asks Dan as to which one he should cut. [[spoiler:Dan picks blue and they fail in defusing the fake bomb.]]
* WithGreatPowerComesGreatResponsibility: Ichika says this in Episode 11 when Houki got the newly gained Aka Tsubaki during their fight against the Gospel.
* TheWorfEffect:
** Cecilia and Rin, being national representatives and possessing custom 3rd generation IS suits, are touted as being the most powerful pilots in the school. Cue them getting {{curbstomp|Battle}}ed by both Yamada-sensei and Laura in separate occasions, with both fights even being a two-on-one.
** Ichika is frequently beaten to demonstrate how serious a new threat is.
** Tatenashi suffers from this in episode 9 of season 2, after having been shown largely effortlessly delivering one CurbStompBattle after another in earlier episodes.
** ''Madoka'' gets hit with this when her suit is destroyed in episode 10.
** Remember how tough Autumn was in episode 4? [[spoiler:She's not so tough against Houki & Cecilia in the season finale. Especially since ''they weren't even paying attention to her'' for most of the fight.]]
** During the World Purge incident, a U.S. special forces team is effortlessly repelled by Tatenashi's ''Mysterious Lady''.
* WorldOfActionGirls: Barring Ichika of course, most of the cast and background characters are {{Action Girl}}s.
[[/folder]]
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