That Time I Got Reincarnated as a Slime (転生したらスライムだった件, Tensei Shitara Suraimu Datta Ken) is a Japanese light novel series written by Fuse and illustrated by Mitz Vah. It was serialized online between 2013 and 2016 on the user-generated novel publishing website Shōsetsuka ni Narō. It was acquired by Micro Magazine, who published the first light novel volume in 2014. Twelve volumes have been released as of July 2018.
The light novel has been licensed in North America by Yen Press, who published the first volume in December 2017. It has received two manga adaptations and an anime television series adaptation by 8-Bit premiered on October 2, 2018.
Lonely thirty-seven-year-old Satoru Mikami is stuck in a dead-end job, unhappy with his mundane life, but after dying at the hands of a robber, he awakens to a fresh start in a fantasy realm...as a slime monster! As he acclimates to his goopy new existence, his exploits with the other monsters set off a chain of events that will change his new world forever!
Fuse originally serialized the series as a web novel on the user-generated content site Shōsetsuka ni Narō between February 20, 2013 and January 1, 2016.
The series was acquired for print publication by Micro Magazine, who published the first light novel, with illustrations by Mitz Vah, under their GC Novels in May 2014. English publisher Yen Press announced their license to the series during their panel at Sakura-Con on April 15, 2017.
Taiki Kawakami launched a manga adaptation in Kodansha's shōnen manga magazine Monthly Shōnen Sirius on March 26, 2015.Kodansha USA announced their license to the manga during their panel at New York Comic Con on October 6, 2016. A second manga, titled That Time I Got Reincarnated as a Slime: How Monsters Walk (転生したらスライムだった件～魔物の国の歩き方～ Tensei Shitara Slime Datta Ken: Mamono no Arukikata), with art by Shō Okagiri, has been serialized on Micro Magazine's Comic Ride website since July 28, 2016. A spin-off manga titled Tensei Shitara Shachiku Datta Ken illustrated by Shizuku Akechi has been announced.
A two-cour anime television series adaptation premiered on October 2, 2018 on Tokyo MX and other channels. The series is animated by 8-Bit and directed by Yasuhito Kikuchi, with Atsushi Nakayama as assistant director, Kazuyuki Fudeyasu handling series composition, Ryouma Ebata designing the characters, and Takahiro Kishida providing monster designs. Elements Garden is composing the series' music. Takuma Terashima is performing the series' opening theme song "Nameless story". True is performing the series' ending theme song "Another colony". The series is simulcast by Crunchyroll with Funimation streaming a Simuldub. The series will run for 24 episodes.