Season 1

Season 1 was first announced on March 7, 2018. It was later announced that the series would run for two cours, and premiered on October 1, 2018. The series was simulcast by Crunchyroll, with a simuldub by Funimation that premiered on October 22, 2018. The first season ran for 24 episodes and 1 special episode. Season 1 was produced by and ran for 24 episodes and a special episode. This series aired from October 2, 2018 to March 26, 2019 and had an extra of 5 OADs afterwards. The series was simulcast by, with a simuldub by that premiered on October 22, 2018. premiered all 24 + 1 special episode to audiences in Asia.

Synopsis
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, 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!