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That Time I Got Reincarnated as a Slime (Japanese: 転生したらスライムだった件, Hepburn: Tensei Shitara Suraimu Datta Ken), also known as Regarding Reincarnated to Slime[b] and by the contraction TenSura (転スラ), is a Japanese fantasy light novel series written by Fuse [ja], and illustrated by Mitz Vah. The story follows Satoru Mikami, a salaryman who is murdered and then reincarnated in a sword and sorcery world as the titular slime, who goes on to gather allies to build their own nation of monsters.
It was serialized online from 2013 to 2016 on the user-generated novel publishing website Shōsetsuka ni Narō. It was later acquired by Micro Magazine, which published the first light novel volume in 2014. Twenty-one volumes have been released as of October 2023. The light novel has been licensed in North America by Yen Press, who published the first volume in December 2017. It has received a manga adaptation published by Kodansha along with five manga spin-offs published, respectively, by Micro Magazine and Kodansha, and an anime television series adaptation produced by Eight Bit, which aired from October 2018 to March 2019. A second season of the anime series aired from January to September 2021, and an anime adaptation of the second spin-off manga aired from April to June 2021. An anime film was released in November 2022. A three-episode original net animation spin-off titled Visions of Coleus was released in November 2023. A third season aired from April to September 2024. A fourth season has been announced, along with a second film.
Lonely thirty-seven-year-old Satoru Mikami is stuck in a dead-end job, unhappy with their mundane life, but after dying at the hands of a robber, they awaken to a fresh start in a fantasy realm… as a slime! As Rimuru acclimates to their goopy new existence, their exploits with the other monsters set off a chain of events that will change the world forever!