He's an actor of the Summer Troupe. One day, he settled down in one of the Mankai Company's dorms without permission and lived in a room for some days without getting noticed. He is hard to make sense of and always enthusiastic and full of energy. Misumi also constantly thinks about triangles and collects everything in a triangle shape. His physical abilities are really high, so much so that he can even run around the dorm walls and ceilings.