An office worker in Japan is reborn in another world and learns to love the craft of magical toolmaking.

The story takes place between the first and second seasons, where Rimuru confronts the swirling conspiracies in the Coleus kingdom.

Follows Oliver Horn as he enters a prestigious magic school named Kimberly. He discovers that not everything is as it seems, with the emergence of labyrinths, monsters, and other threats that endanger the students.