It has received a manga adaptation published by Kodansha along with three manga spin-offs published respectively by Micro Magazine and Kodansha and an anime television series adaptation by Eight Bit, which aired from October 2018 to March 2019. The light novel has been licensed in North America by Yen Press, who published the first volume in December 2017. Sixteen volumes have been released as of March 2020. It was acquired by Micro Magazine, who published the first light novel volume in 2014.

It was serialized online between 20 on the user-generated novel publishing website Shōsetsuka ni Narō. 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 TenSura (転スラ) or Slime Isekai is a Japanese fantasy light novel series written by Fuse, and illustrated by Mitz Vah.