History VideoGame / ThirteenSentinelsAegisRim

* TimeTravel: While most of the main cast hail from the present era of UsefulNotes/The80s, some hail from a BadFuture where the Kaiju invaded, and others from the World War II era, and all come together to deal with a mutual threat. [[spoiler: Actually {{Subverted|Trope}}. There are no real examples of Time Travel in the game and the characters are simply under the WrongAssumption it's real. The game actually takes place thousands of years AfterTheEnd in a colony on a different planet, where all the characters are InsideAComputerSystem. The creators of Project Ark felt humanity should restart in an era before the incident that ruined Earth, but couldn't decide on which one, so they based the 5 residential zones (known collectively as Sectors) to look like different time periods, where each character would live until they became 20 years old and could leave the simulation: Sector 1 (2089 to 2109), Sector 2 (2049 to 2069), Sector 3 (2009 to 2029), Sector 4 (1969 to 1989) and Sector 5 (1929 to 1949). What ''looks'' like TimeTravel is simply a [[{{Teleportation}} spatial relocation]] to other Sectors inside the simulation managed by [[MasterComputer Universal Control]].]]

* OnlyTheLeadsGetAHappyEnding: Played with in interesting but rather disturbing fashion. [[spoiler:EverybodyLives, but only in ''this'' loop and colony. Because overcoming DEIMOS was so difficult, many ''many'' generations of clones were killed before every leaving their pods. What's more, there's an unknown number of machines spreading all across the universe, all corrupted by the D-Code to have an abysmal failure (both for each individual generation, but probably the colonies themselves).]]

''13 Sentinels: Aegis Rim'' is a narrative-focused AdventureGame with [[RealTimeStrategy Real Time Tactics]] gameplay segments developed by Creator/{{Vanillaware}} and published by Creator/{{Atlus}}. It was first teased in a preview video in July 2015 as a collaboration project between Atlus, before being finally revealed in the 2015 Tokyo Game Show. The game was released for the UsefulNotes/PlayStation4 on November 28, 2019 in Japan. A playable demo was released on March 14, containing the game's first three hours. It was released overseas on September 22, 2020 with EFIGS support and an English dub.

A UsefulNotes/NintendoSwitch version was released on April 12, 2022. This was notably the first time a Vanillaware game has been released on non-[=PlayStation=] hardware since ''VideoGame/MuramasaTheDemonBlade's'' original release on the UsefulNotes/{{Wii}} in 2009.

* TimeTravel: While most of the main cast hail from the present era of UsefulNotes/TheEighties, some hail from a BadFuture where the Kaiju invaded, and others from the World War II era, and all come together to deal with a mutual threat. [[spoiler: Actually {{Subverted|Trope}}. There are no real examples of Time Travel in the game and the characters are simply under the WrongAssumption it's real. The game actually takes place thousands of years AfterTheEnd in a colony on a different planet, where all the characters are InsideAComputerSystem. The creators of Project Ark felt humanity should restart in an era before the incident that ruined Earth, but couldn't decide on which one, so they based the 5 residential zones (known collectively as Sectors) to look like different time periods, where each character would live until they became 20 years old and could leave the simulation: Sector 1 (2089 to 2109), Sector 2 (2049 to 2069), Sector 3 (2009 to 2029), Sector 4 (1969 to 1989) and Sector 5 (1929 to 1949). What ''looks'' like TimeTravel is simply a [[{{Teleportation}} spatial relocation]] to other Sectors inside the simulation managed by [[MasterComputer Universal Control]].]]

* FictionalCounterpart: Multiple movies are referenced within the story, but with fictionalized names. The "Deimos" film series is a clear parallel to ''Franchise/{{Godzilla}}'', and Minami mentions watching "E.X.T." multiple times in theaters, saying that it was a 1982 classic, the year that ''Film/ETTheExtraTerrestrial'' came out. Interestingly, the game doesn't do this for non-copyrited properties. In the same scene that Minami mentions "E.X.T.", she also specifically namedrops ''Literature/WarOfTheWorlds'' which, unlike ''E.T.'', is in the public domain.

* AlienInvasion: Most characters assume the Deimos that are invading the world are aliens. [[spoiler:This turns out to be a WrongAssumption. They are actually heavy machinery made by Shikishima Industries for terraforming planets, and were inserted into the simulation by a heartbroken Shinonome in 2188 who had lost hope for humanity and wanted to KillAllHumans.]]
** 13 Sentinels then adds the interesting twist by comparing [[human space colonization to an alien invasion, as humans coming to a new planet would be the aliens for that planet. The monitoring sattelite for Project Arc is even referred to as the mothership, and the mainframes below each sector built by humans as UFOs.]]

** The [[SkeleBot9000 androids]] Nenji and Kisaragi find in the ruined 2025 are also an {{Expy}} to Franchise/{{Terminator}}s, with Nenji even commenting they "Look straight out of "[[BlandNameProduct Exterminator]]".

* EarnYourHappyEnding: [[spoiler: It takes god-knows-how-long of looping, but the DEIMOS simulation is brought to heel during the game, allowing humanity to finally rebuild on a distant world using the Sentinels.]]
** [[spoiler: Around 300 loops or around 5000 years spend in the final phase. The probes themselves carrying the genetic infomation and each with a version of Project Arc have been travelling the universe for millions of years.]]

* CloningBlues: [[spoiler: All the "compatible" are clones of the last 15 living members of humanity from original Earth, the 13 protagonists plus Okino and Tamao. Some of the characters have difficulty coming to terms with what their original is like (Ryoko is devastated to realize that her original released the Deimos to make sure Project Ark would fail, Natsuno is shocked that her original self is the daughter of the original Yuki and Takatoshi is deep in denial about his original's romantic relationship with Okino).]]

A UsefulNotes/NintendoSwitch version was released on April 12, 2022. This is notably the first time a Vanillaware game has been released on non-[=PlayStation=] hardware since ''VideoGame/MuramasaTheDemonBlade's'' original release on the UsefulNotes/{{Wii}} in 2009.

* ApocalypticLog: As the story progresses, the characters unveil a lot of logs left [[spoiler:by their original selves from 2188, which help explain the state of the world]].

* BodySurf: [[spoiler: Nanomachine technology in the future made it possible for people to be "mind-hacked" and having their bodies taken over. This became a huge issue in 2188 and it's what led to the extinction of humanity. In the story itself, 426 (Juro Izumi from 2 loops before) uses this to take over Tamao's android body and later jumps into Juro Kurabe's body. He also uses it sparingly on Megumi to manifest himself as Fluffy to her.]]

* EternalRecurrence: [[spoiler: This explains why there are multiple flashbacks with characters having different names and doing actions that are inconsistent with how they normally act. The protagonists are clones of people who lived in 2188 who are InsideAComputerSystem. When the Deimos destroy every sector and reach the center the facility disposes of the clones and resets the system. However, using Sector 0, the personality and memories of a clone can be stored into an AI with a simulated body inside of the simulation for the next loops. It's unknown how long the colony has been stuck in this loop, with the player knowing it happened at least three times. The "Eternal" part also ends up {{subverted|trope}} as the resets are taking a toll on the facility and Morimura learns that the current loop will be the last one, as one more will cause permanent damage on the colony.]] The game's [[TheStinger stinger]] also shows that [[spoiler:this is likely happening on ''every'' planet that the clone probes reached, as it shows a variation on the game's opening scene, but with Nenji and Natsuno instead of Iori.]]

* InterfaceSpoiler: The presence of the [[spoiler:event timeline, which quickly begins placing scenes in ways that don't make sense given the years that they take place, can clue players in to the fact that there is no actual time travel in the story. Lessened as a player might think that the timeline is ordered in another way, such as by a single character's perspective, or that it's ordered in whatever way makes the story most coherent.]]

** All of the protagonists are [[OutOfClothesExperience nude while piloting their Sentinels]] with various [[ShouldersUpNudity camera angles]] for both [[FemaleGaze male]] and [[MaleGaze female]] pilots, especially Iori and Megumi who show quite a lot of {{Sideboob}} in their portraits. Ironically downplayed by MsFanservice Chihiro Morimura, who's the only character show wearing clothes while inside a Sentinel, although the camera angle still focuses on her cleavage.

Unlike the developer's previous effort, this game takes place in a more modern setting, albeit one with giant mechs. The game is directed by George Kamitani, with the music composed by members of Music/{{Basiscape}}.

''13 Sentinels: Aegis Rim'' is a VisualNovel AdventureGame with [[RealTimeStrategy Real Time Tactics]] gameplay segments developed by Creator/{{Vanillaware}} and published by Creator/{{Atlus}}. It was first teased in a preview video in July 2015 as a collaboration project between Atlus, before being finally revealed in the 2015 Tokyo Game Show. The game was released for the UsefulNotes/PlayStation4 on November 28, 2019 in Japan. A playable demo was released on March 14, containing the game's first three hours. It was released overseas on September 22, 2020 with EFIGS support and an English dub.

* SenpaiKohai: While most of the protagonists are first-year high schoolers, Ryoko, Renya and Hijiyama are second-years. Renya in particular commands a lot of respect from the first-years.

* OffscreenMomentOfAwesome: The brutal physical battle between androids in the North Building girls' bathroom that absolutely trashes the place is seen entirely from Natsume's perspective... who spends the whole thing cowering in a bathroom stall barely able to understand what's happening.

* SempaiKohai: While most of the protagonists are first-year high schoolers, Ryoko, Renya and Hijiyama are second-years. Renya in particular commands a lot of respect from the first-years.

* FoodPorn: The game features various food and dishes that the characters enjoy so much and they show the food in such great detail that you'd end up feeling hungry for them. In fact, in celebration of the game's release on the Nintendo Switch, Atlus has uploaded recipes of 3 of the most popular dishes from the game, so that you can now make them and enjoy them for yourself.

* FoodPorn: The game features various of dishes that the characters enjoy so much and they show the food in such great detail that you'd end up feeling hungry for them. In fact, in celebration of the game's release on the Nintendo Switch, Atlus has uploaded recipes of 3 of the most popular dishes from the game, so that you can now make them and enjoy them for yourself.

* FoodPorn: The game features various of dishes that the characters enjoy so much and they show the food in such great detail that you'd end up feel hungry for them. In fact, in celebration of the game's release on the Nintendo Switch, Atlus has uploaded recipes of 3 of the most popular dishes from the game, so that you can now make them and enjoy them for yourself.

** [[MsFanservice Ms. Morimura]] is the biggest example, being a HeadTurningBeauty with a [[BuxomIsBetter very sizable chest]] that is bouncing constantly and has a tendency to wear a {{Future|Spandex}} SensualSpandex that is very [[FormFittingWardrobe figure-hugging]], and she usually stands in a BoobsAndButtPose while wearing it.

** Natsuno Minami wears a SchoolSportUniform that [[ShesGotLegs exposes her legs]] for the majority of her screentime.

* GameplayAndStoryIntegration: An amusing example occurs early in Iori's story. Natsumi complains how the classroom doors take a frustratingly long time to open because the school building is so old and decrepit, riffing on the large amount of dialogue and other stuff you have to get through in the previous chapter before the option to leave the room becomes available.

** [[MsFanservice Ms. Morimura]] is the biggest example, being a HeadTurningBeauty with a [[BuxomIsBetter very sizable chest]] that is {{Gainaxing}} constantly and has a tendency to wear a {{Future|Spandex}} SensualSpandex that is very [[FormFittingWardrobe figure-hugging]], and she usually stands in a BoobsAndButtPose while wearing it.

Unlike the developer's previous effort, this game takes place in a more modern setting, albeit one with giant mechs. The game is directed by George Kamitani, with the music composed by members of Creator/{{Basiscape}}.