Isekai is a genre of fantasy anime where a character travels from the world they know to an unfamiliar one. Typically, isekai series will place a person in a magical realm of fantasy and/or terror, though occasionally it happens in reverse. The Devil Is a Part-Timer!, for instance, shows what happens when Satan must adjust to life in Tokyo - which means getting a job in fast food. Some isekai anime, like Sword Art Online and Log Horizon, take place in virtual worlds or MMORPGs, while others feature real worlds with real people living in them.
When it comes to the best isekai anime, the finest series present viewers with worlds just as compelling as any protagonist. If you're looking for an anime to transport you to another world, try one of these.
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When a middle aged man named Satoru Mikami is randomly stabbed on the street, he's reincarnated into another world - not as a wizard, a demon, or anything else a person would hope for, but as a slime! Luckily for Rimuru Tempest - that's his new name - he's not just any slime. He can absorb new skills from his environment and from his foes, giving him a seemingly endless array of abilities. While Rimuru could use those powers to do harm, he chooses instead to build community and help others - just as he tried to do through his company job on Earth.
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The Rising of the Shield Hero, which began airing during the Winter 2019 anime season, is one of the hottest anime series around. It follows Naofumi Iwatani, an otaku who is suddenly transported to the world of Melromarc to fulfil a mission: he must help defeat the Waves of Catastrophe that are wrecking havoc on the world with the help of three other legendary heroes. Unfortuantely for Naofumi, he's the Shield Hero, which means that he's looked down on from the start. Worse, the one person who pretends to be willing to help him betrays him and destroys his reputation, forcing him to complete his mission alone if he ever wants to see his home again.
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When Momonga's favorite MMORPG, Yggdrasil, is about to go offline, he decides to wait out the game's last moments and stay logged in for as long as he can. But when the game is supposed to shut down, it doesn't. Instead, the NPCs are coming to life, and Momonga has become his character, the wizard master of the dark guild Ainz Ooal Gown. He'll have to get used to his new life - and figure out how to run his guild for real.
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No Game No Life gets to the point immediately with its name alone. While they are incredible gamers, Sora and Shiro lack the skills to accomplish anything meaningful in their current world. In fact, they're so wracked with social anxiety that most of the time they can barely leave the house. Their lives change for the better when they get the chance to live in Disboard, a world where gaming determines every interaction and transaction.
There, they become wildly successful beyond anything they imagined possible in their old world, achieving royal status and uniting the warring factions of Disboard through gaming.