Yoshino's grandfather and the head of the Somei-gumi, a direct branch of the Kansai region's largest designated crime syndicate, the Kirigaya-gumi.

Kirishima's grandfather and the leader of the Miyama family, a direct branch of the Kanto region's largest gambling-based designated crime syndicate, the Toshakai. He is a longtime friend of Renji Somei, one of the few friends the socially selective Renji has.

Kirishima Miyama (深山 霧島) Height: 175–178cm He reportedly lost his virginity in the 6th grade and lived as a gigolo during middle school. While pursuing Yoshino, he continues to have secret trysts with numerous women, not hesitating to use them for his own ends. He has explicitly stated that his preference is to be treated with total disregard for his human rights, being messily manipulated by an incredibly selfish and self-centered woman. He has a dual personality.

Shoma Toriashi (鳥葦 翔真) Age: 20 He loves Yoshino, who pulled him out of a life in the gutter, to the point of calling her his reason for living and someone worth dying for. Consequently, he immediately saw through the true nature of Kirishima, who is abnormally obsessed with Yoshino, and has been extremely hostile toward him since their first meeting. Like a true yakuza, he has tattoos covering his entire back and both arms.