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) 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.