That Time I Got Reincarnated as a Slime
Corporate worker Mikami Satoru is stabbed by a random killer, and is reborn to an alternate world. But he turns out to be reborn a slime! Thrown into this new world with the name Rimuru, he begins his quest to create a world that’s welcoming to all races.
Vivian's Take
The hook
Most isekai heroes get reborn as legendary swordsmen or demon lords. Satoru Mikami gets reborn as a blob. A slime — the weakest monster in every role-playing game ever made, the thing first-level adventurers farm for experience points. And then he builds a nation anyway. That Time I Got Reincarnated as a Slime is the coziest epic in anime: a show about a man who responds to unlimited power by founding a country with universal healthcare, public baths, and a dungeon-based tourism industry. It's nation-building as comfort food, and it's magnificent.
The secret is Rimuru Tempest himself. Where other isekai protagonists brood, scheme, or collect harems, Rimuru just wants everyone to get along — and happens to be functionally immortal while he works on it. Watching him turn a goblin village into a federation is the most relaxing power fantasy ever animated.
The premise
Satoru Mikami is a 37-year-old Tokyo salaryman — decent job, good friends, no complaints except one (he hopes someone wipes his hard drive after he dies). When he's stabbed protecting a coworker from a street attacker, he wakes up in a fantasy world as a slime, with two absurdly useful abilities: Predator, which lets him devour anything and absorb its powers, and the Great Sage, a analytical voice in his head that functions as a walking supercomputer. His first friend is Veldora, a storm dragon sealed in a cave for 300 years; Rimuru (the name Veldora gives him) swallows the dragon whole to analyze the seal, accidentally destabilizing the region's geopolitics.
From there, the show becomes something almost no isekai attempts: a city-builder. Rimuru rescues a goblin village from direwolves, names its inhabitants (granting them evolutions and his own family name, Tempest), recruits ogres, lizardmen, dwarves, and dryads, and founds the Jura Tempest Federation — a monster nation built on trade, infrastructure, and diplomacy. The fantasy isn't the magic; it's competent governance. Rimuru negotiates trade deals with dwarven kingdoms, builds a dungeon as a tourist attraction, and slowly becomes a Demon Lord — first by necessity, then by acclamation — while remaining, at heart, a middle manager who just wants the quarterly report to look good.
Cast & characters
Miho Okasaki voices Rimuru with the perfect blend of deadpan scheming and genuine warmth — her performance, equal parts corporate presentation and playground excitement, is why the character works. The supporting cast is a small army: Megumi Toyoguchi as the Great Sage (later Raphael), Tomoaki Maeno as the bombastic Veldora, Takuya Eguchi, Hochu Otsuka, and the rest of Rimuru's growing cabinet of once-monstrous, now-bureaucratic retainers. Standouts include Shion, the devoted ogre secretary whose cooking is a war crime; Benimaru, the kijin general; the scene-stealing Milim, a Demon Lord with the energy of a sugar-rushed child; and Diablo, the primordial demon who treats Rimuru with terrifying reverence. The English dub, Crunchyroll's flagship for the franchise, has been equally praised.
Season by season
Season one (2018, twenty-four episodes) covers the founding of Tempest, from slime-in-a-cave to recognized nation. Season two (2021, twenty-four episodes across two cours) goes darker: the Kingdom of Falmuth massacres Tempest's civilians, and Rimuru — pushed past his easygoing limit — harvests ten thousand souls to resurrect his people and ascends as a True Demon Lord, then founds the Octagram, the new council of eight Demon Lords. The film Scarlet Bond (November 2022) expanded the world theatrically. Season three (2024, twenty-four episodes) dealt with the political fallout — diplomacy, the church, and the scheming of the other Demon Lords. The second film, Tears of the Azure Sea (February 2026), bridged into the current run. Season four (premiered April 3, 2026) is the franchise's biggest swing yet: a planned five-cour epic, with the first two cours airing consecutively, following Demon Lord Rimuru's deepening conflict with the Rozzo family and the awakening of a new Hero. Studio 8-Bit has animated every installment, with Miho Okasaki returning throughout.
Critical reception
The series has been a consistent critical and commercial success. Rimuru won Best Protagonist at the 3rd Crunchyroll Anime Awards in 2019; the second season won Best Fantasy at the 2022 awards; the third season was nominated for Best Isekai at the 2025 awards. It sits around 8.2 on MyAnimeList, firmly in the upper echelon of the genre. Critics have praised its sincerity — Polygon called it "the coziest isekai," noting that unlike most of the genre's tortured protagonists, Rimuru's story has almost no angst, and that's the point. The nation-building is treated with genuine economic and political thought, which gives the comfort food real substance. (The franchise's one brush with infamy: in 2021, Russia's government placed it under a limited ban along with several other isekai titles, objecting to its depiction of reincarnation.)
Cultural impact
That Time I Got Reincarnated as a Slime — "Tensura" to its fans — essentially invented the nation-building isekai, spawning a wave of imitators about protagonists who found kingdoms instead of swinging swords. Based on Fuse's light novel series (illustrated by Mitz Vah, one of the best-selling isekai franchises in print), it proved that the genre's audience was hungry for something gentler: competence porn with a heart. Rimuru became one of anime's most beloved protagonists precisely because he rejects the genre's usual power-trip cruelty — his first instinct is always to talk, trade, and build. In a medium full of chosen ones, the slime who chose everyone else turned out to be the most radical hero of all.
The verdict: A — The isekai that traded conquest for community and became a genre cornerstone in the process.