The original Tensei Shitara Slime Datta Ken manga has a spin-off called Tensei Shite mo Shachiku Datta Ken; however, this spin-off has come to an end, with the final chapter being published by Kodansha's Monthly Shonen Sirius magazine.
Synopsis: After being unexpectedly killed by a fleeing thief, a normal 37-year-old man finds himself reincarnated in another world as a blind slime with unique abilities. With a new name, "Rimuru Tempest," he arrives after meeting his new friend, the "catastrophe-level" Storm Dragon Verudora, and begins his slime life in another world with his growing number of followers.
The spin-off still features the same protagonist, but tells a story in which he returns to his previous life while still in slime form.
The first season of the Tensei Shitara Slime Datta Ken aired in October 2018.
The second season will be divided into two parts , the first airing in October of this year and the second later in April 2021.
The studio will be 8-Bits , the same one from the first season. Crunchyroll will stream the anime in the Americas, Europe, Asia, and Oceania.
The first season is officially available on Crunchyroll.
Source: ANN