History Literature / ThatTimeIGotReincarnatedAsASlime

''That Time I Got Reincarnated as a Slime'' (''Tensei Shitara Slime Datta Ken'') is a series of web-novels turned light novels by Fuse and illustration by Mitz Vah. This series is adapted to manga by Taiki Kawakami and an anime by Studio 8 bit. On September 21, 2021, following the conclusion of Season 2, a movie titled ''That Time I Got Reincarnated as a Slime the Movie: Scarlet Bond'' was announced and released on November 25, 2022.

* PerfectlyCromulentWord: The "Beastketeers" of Yuurazania, a combination of the words "Beastmen" and "[[Franchise/TheThreeMusketeers Musketeers]]". They act as a kind of PraetorianGuard for their liege, the Demon Lord Carrion.

After dying while protecting his junior colleague at work from a knife attack, Satoru Mikami is reincarnated as a slime in a magical world. As someone who is reincarnated, he gains the Skills "Predator" and "Great Sage". While strolling around, he meets the Storm Dragon Veldora who becomes his friend and names him Rimuru. In return, Rimuru gives the surname Tempest to both of them and agrees to snatch Veldora from his prison so that one day they can permanently break Veldora's prison. The mysterious disappearance of the Storm Dragon results in huge consequences as his presence acted as a sort of buffer zone. Meanwhile, Rimuru starts his adventure by traveling, meeting new people, fighting some of them, and turning them into allies by fighting them. He is guided by a mysterious interface, the Great Sage, which teaches him how to use his unique skill, "Predator", an almost limitless ability to eat and assimilate living things and objects. Rimuru begins to adopt the forms and abilities of everything he absorbs, which makes him very strong, but also a target.

* {{Cap}}: Once a demon evolves into an Arch-Demon, their magicule count won't grow any higher past a certain point. At that point, it is cunning, experience, and mastery of magic and Skills that determines their place in demon society. [[spoiler:The only way to break this cap is to evolve into a Demon Peer, which under most circumstances requires being named and having managed to remain at that peak of power for several centuries without dying and resurrecting.]]

** The Ork Disaster Geld was finished the moment Rimuru grappeled with him in slime form. The manga even has Veldora comment on it, realizing that in a battle of consumption, none could match Rimuru's feat of devouring both him ''and'' the seal holding him at once.

** His fight with Ifrit was already won tanks to his [thermal resistance] skill, meaning Ifrit could not do damage to him.

* MagicSkirt: In the rare instances of skirt-wearing women doing active work, such as Ramiris, Suphia of the Beastketeers, and Milim in her SuperMode [[{{Irony}}(despite her regular outfit shamelessly showing far more)]], their modesty is consistently protected.

** In contrast to how humans and human-like races (dwarves and elves) maintain their rulership based on their capacity to lead regardless of personal power (there are strong human, dwarf, and elf leaders, but their power is secondary to how well they command their nations), completely inhuman races like monsters and demons maintain hierarchies based on who is the strongest. The absolute rulers of each non-human-based nation are the absolute strongest among them, along with all secondary leaders underneath them being leagues stronger than the regular soldiers. As a result of this power hierarchy, the idea of RoyalsWhoActuallyDoSomething and {{Frontline General}}s is present everywhere. Additionally, inhuman biology also incorporates AuthorityGrantsAsskicking, as gaining a higher position in a hierarchy boosts a monster's abilities to ''make'' them better asskickers, with more asskicking-earned authority instilling higher amounts of authority-granted asskicking power.

* ProphecyTwist: Rimuru has his fortune of a woman he is destined to be with. He assumes that this means lovers. [[spoiler:Said woman actually dies shortly after he meets her, but her dying wish is that he assimilate her.]

* ProphecyTwist: Rimuru has his fortune of a woman he is destined to be with. He assumes that this means lovers. [[spoiler:Said woman actually dies shortly after he meets her, but her dying wish is that he assimilate her.]]
* ReincarnatedAsANonHumanoid: Satoru goes from exhausted office worker to slime as Rimiru, and gets stronger over time. Whilst he gets a humanoid form fairly quickly, his "base" form is still basically an [[CuteSlimeMook adorable puddle of goo]].

* ReincarnatedAsANonHuman: Satoru goes from exhausted office worker to slime as Rimiru, and gets stronger over time. Whilst he gets a humanoid form fairly quickly, his "base" form is still basically an [[CuteSlimeMook adorable puddle of goo]].

** The Ork Disaster Geld was finished the moment Rimuru grappeled with him in slime form. The manga even has Veldora comment on it, realizing that in a battle of consumption, none could match Rimuru's feat of devowering both him ''and'' the seal holding him at once.

* RealityIsUnrealistic: Megiddo is actually realistic, conveting enough solar energy to make a death beam with the potentcy of an industrial laser cutter would only need a lens with a diameter of 2.14 meters. The lenses used in Megiddo are 3 meters wide, making them more than potent enough to pierce through steel plate and brain matter.

** The [[DragonsAreDivine True Dragons]], however, are another beast entirely. Whereas normal dragons are still flesh-and-blood beings to an extent, the True Dragons are spiritual beings who are more akin to sentient forces of nature and gods, and there can only be one specific type of True Dragon at a time as designated by The World. [[ResurrectiveImmortality If one dies, it will eventually resurrect]] (albeit with some memory loss) save in very specific circumstances.

* MagicSkirt: In the rare instances of skirt-wearing women doing active work, such as Ramiris, Suphia of the Beastketeers, and Milim in her SuperMode {despite [[{{Irony}} her regular outfit shamelessly showing far more]]), their modesty is consistently protected.

** Episode 47: As it becomes rapidly apparent to Clayman that he has been {{Outgambitted}} and forced into a fight with Rimuru and his subordinates that he can't win, he attempts to [[spoiler: order Milim to kill everyone so that he can escape]], the following line hammers home just ''how'' thouroughly Clayman was played.

* MagicSkirt: In the rare instances of skirt-wearing women doing active work, such as Suphia of the Beastketeers and Milim in her SuperMode {despite [[{{Irony}} her regular outfit shamelessly showing far more]]), their modesty is consistently protected.

* MagicSkirt: In the rare instances of skirt-wearing women doing active work, such as Suphia of the Beastketeers and Milim in her SuperMode [[{{Irony}}(despite her regular outfit shamelessly showing far more)]], their modesty is consistently protected.

* DontTryThisAtHome: A disclaimer reading "Never attempt this" pops up as we see Temura dump his computer (plugged in, no less) into the bathtub, as Rimuru told him to do before dying.

** Characters are often compared to a vague 'Demon Lord' or 'Awakened/True Demon Lord' level and for mooks it's always the vague A rank or above A rank metric. This doesn't serve as very good hype since one of the first demon lords seen, Clayman, goes down like a complete chump since Rimuru has already reached that level of power when he fought him while "True Demon Lord" can range from small fry like Ramiris to literal gods depending on how much power they gained before their ascension and how much they kept building it up afterwards.
** This actually pointed out in the light novel that anyone who reaches a certain level of power can ''proclaim'' themselves a Demon Lord, but in order to be officially recognized as such they need the backing of two existing Lords or be ruthlessly crushed by the established ones. So many such self-proclaimed Lords have come into existence that at least one human kingdom doesn't even consider it a big deal. Milim herself notes Rimuru had already surpassed the minimum power requirement to become a Demon Lord just days after fighting and absorbing the Orc Disaster. A similar case occurs with the "Ten Great Demon Lords" as only four of them were "True" Demon Lords while most of them were only self-proclaimed Demon Lords of varying degrees of strength. [[spoiler:Carrion and Frey even stepped down after Rimuru defeated Clayman since they realized they couldn't match up to the rest.]]

* YourDaysAreNumbered: Once a Summon (a person yanked from the different world by magic) fails to develop a skill that allows them to deal with the enormous level of magicules acquired during the ritual — [[WeHaveReserves which is a common, and even a normal occurence]] — [[PhlebotinumOverdose their bodies fail within several years]]. This is especially the case for anyone summoned when still immature, i.e. children [[spoiler:which is why Leon bound Ifrit to Shizu, as that would prevent the phenomenon from occuring for decades]].

* CivilizationDestroyer: The higher-level True Demon Lords, Primordial Demons and the True Dragons are all capable of this, with it being on record they destroyed plenty of countries and cultures in the past. The angels meanwhile carry out systematic purges of civilizations they deem as too advanced from their preferred MedievalStasis. The only reason most don't get around to destroying the whole planet is either because they like the planet itself or they're stopped by the ones that don't want the planet to become a smoking crater.

* TheThingThatGoesDoink: Rimuru's hot spring bathhouse features a shishi-odoshi for that touch of traditional Japan.

* HaremGenre: {{Play|ingWithATrope}}ed with, as while Rimuru identifies as male, admits that he would want to finally give up his "virgin" status, is very much an admirer of the womanly form, and there's no shortage of interested females, [[NoBiologicalSex his "little brother" no longer exists]]. Though he does admit even that with his shape changing ability, that is [[CelibateHero entirely by choice]]. Doesn't stop an entire UnwantedHarem from being formed as they all vie for the position of "TopWife", and seem content just ''being'' with him.

* HaremGenre: Hilariously [[SubvertedTrope subverted]], as while Rimuru identifies as male, admits that he would want to finally give up his "virgin" status, is very much an admirer of the womanly form, and there's no shortage of interested females, [[NoBiologicalSex his "little brother" no longer exists]]. Though he does admit even that with his shape changing ability, that is [[CelibateHero entirely by choice]].

* EarlyBirdCameo: Before Shizue is officially introduced in the episode named after her ''Shizu'', she first appeared during the beginning of the pilot episode, where was sucked into a fire and died... only to be brought into the fantasy world and featured five episodes later.