Students keep getting hurt as they try to find the treasure on the map Keena put up. Akuto, in his role as disciplinary committee member, insists that they give up looking, but a girl named Teruya Eiko appears suddenly and he ends up having to find it himself. Akuto, Korone, and Hiroshi go to the school's underground labyrinth to find the spot on the map. But they find there a treasure once allowed only to a Demon Lord.
He's running away.