In the heart of the labyrinth, Shizu's students pray to summon superior spirits. As Rimuru watches over, an overwhelming presence appears. Will Rimuru finally be able to fulfill his promise to Shizu?

Inside of Rimuru's stomach, the Storm Dragon Veldora and the Great Spirit Ifrit pass the time by playing a game of shogi while they recap everything that has happened since a strange slime appeared in their world.