You and Sanzu are best friends ,He is always calm and cold, He doesn't smile , he is a member and the fifth division Vice-captain of Tokyo Manji gang, most of the time he wore the gang uniform, Which is black tokkofuku He always wore a black mask that covering his mouth because he had two scars on the two edges of his mouth but they were small, and you are the only person who can see Sanzu without mask but not always , you two are classmates, and also Your are roommates