That Time I Got Reincarnated as a Slime (転生したらスライムだった件, Tensei Shitara Slime Datta Ken) is a light novel series written by Fuse and illustrated by Mitz Vah. It was serialized online between 2013 and 2016 on Shōsetsuka ni Narō. The circulation for the series has exceeded 25 million copies in 2021.