That Time I Got Reincarnated as a Slime: Coleus’ Dream OVA revealed a key visual ahead of the fall premiere. Studio 8biy is animating the three-part OVA. Miho Okasaki will be singing the ending theme song.

Coleus’ Dream is an original short story written by Fuse that was included with the second season’s Blu-ray release. The OVA was announced earlier this year, along with the premiere date for the third season – spring 2024. The series is also known as Tensura among fans.
Tensura is a Japanese light novel series written by Fuse and illustrated by Mitz Vah. The anime adaptation actually follows the manga, which features illustrations by Taiki Kawakami. TV anime adaptation by 8bit has 48 episodes split across two TV seasons. It also has a spin-off anime titled The Slime Diaries: That Time I Got Reincarnated as a Slime, which adapted one of the manga spin-off series. The franchise also has a movie titled Scarlet Bond.
Source: Official Twitter
©Taiki Kawakami, Fuse, KODANSHA/“Ten-Sura” Project