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 last chapter being published by Kodansha Monthly Shonen Sirius magazine.
Synopsis: After being unexpectedly killed by a fleeing thief, an ordinary 37-year-old boy finds himself reincarnated in another world as a blind slime with unique abilities. With a new name “Rimuru Tempest” he arrived 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 has the same protagonist, but telling a story in which he returns to his previous life still with the slime body.
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 being shown in October this year and the second later in April 2021.
The studio will be 8-Bits , the same as the first season. Crunchyroll will broadcast the anime in the Americas, Europe, Asia and Oceania
The first season is officially available on Crunchyroll
Source: ANN