That Time I Got Reincarnated as a Slime: Trinity in Tempest (Volumes 1 & 2) Set This is an official spin-off comic by Fuse (original work), Tae Tono (manga), and Mitz Vah (character design). The story revolves around Foss, a fox beast-kin girl from the Jura Forest Nations, and the new residents of the Jura Tempest Federation (Tempest). Set in Tempest, the nation founded by Rimuru, the story unfolds with three female characters, each with their own hidden intentions.