Unbeknownst to his classmates, the meek glasses-wearing Mistsuru Kuze, is the third generation boss of the Umegaki Gang. He chooses to keep this a secret to avoid unnecessary attention by donning this persona. Mitsuru became the boss at such a young age, because of his father's hospitalization. 

Mitsuru has a double personality, if he sees blood or anything that looks like it he becomes blood thirsty and ruthless. He is the one who repays Chizuru's debt and forces her to be his fiancee in return. Mitsuru is also secretly in love with Chizuru, due to an incident in which, she kindly bandaged his wounds.