Kei Mitsuhashi

Height: 162cm

Weight: 50kg

Hair Color: Brown

Eye Color: Brown

He is a student at Oodachi High School and a member of its sumo club. Chihiro Kunisaki calls him, Hotaru.

While he lacks size, stamina and strength, he is extremely adaptable and receptive to Tsuji's orders, especially when he was the first person who witnessed his knowledge when he quickly defeated every member of Oodachi High using simple dodges except Hinomaru.