Tensei (reincarnation)
A flavour of isekai where the hero dies and is reborn into the new world, usually keeping past-life memories.
Tensei is the reincarnation branch of isekai: the protagonist dies, is reborn and begins again elsewhere, often with memories of their previous life and a suspiciously useful advantage. It is the narrative equivalent of closing all your tabs and discovering the browser has reopened in a fantasy kingdom.
The form offers more than simple travel. A transported hero is displaced; a reincarnated hero is rewritten. They may start as a baby, monster, noble, villainess, slime or magical prodigy. The old life becomes backstory, guilt, knowledge or a cheat sheet. Sometimes all four, because reincarnation apparently comes with bundled services.
That Time I Got Reincarnated as a Slime turns death into administrative nation-building. Mushoku Tensei treats reincarnation as a long, morally messy second-life biography, and brings caveats with it. The Saga of Tanya the Evil adds military SF and theological spite. Villainess stories such as My Next Life as a Villainess use reincarnation to let heroines dodge a doomed route in a game-like social world.
The danger is moral laundering: a character dies, wakes up with powers and is excused from old consequences because the scenery changed. The better works know that memory is baggage, not just a bonus item.
Tensei suits readers who enjoy second chances, progression, fantasy systems and identity questions. It asks an old wish-fulfilment question in new clothes: if you could live again, would you become better, or merely better equipped?
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