Age: 18-19
Blood type: O
Height: 178 cm
Affiliation: 13th District
Specialized game: Japanese/Sengoku

Kaikoku is a free-spirit with a laid-back and rebellious personality. He is considered as the most perverted from the group and is seen carrying an umbrella everywhere he goes.

As the heir to the Onigasaki clan his grandfather placed extreme pressure and expectations on him, treating him like a doll and causing him to disown his family, running away from homes and turning to games to relieve his emotions.