That Time I got reincarnated as a slime Box Set Season 1 Vol 1 - 6 Box Set English

"That Time I Got Reincarnated as a Slime: Trinity in Tempest" is a light novel and manga series written by Fuse and illustrated by Mitz Vah. It is a spin-off of the popular "That Time I Got Reincarnated as a Slime" series, which follows the adventures of the protagonist Rimuru Tempest, who is reincarnated as a slime in a fantasy world and builds a powerful nation known as the Jura Tempest Federation.

In "Trinity in Tempest," the story explores the lives and adventures of the three powerful demon lords who serve Rimuru: Carrion, Gerudo, and Viscount Mjurran. These demon lords are key figures in the Jura Tempest Federation and play important roles in the development of the nation. The spin-off series delves into their backgrounds, relationships, and the challenges they face in a world filled with various races, nations, and conflicts.