Minamida Kousuke

Minamida Kousuke is a former yakuza member and the pimp and boyfriend of Serina, Atsushi Tanzawa's mother.

Plot
Kousuke makes his first appearance in Atsushi Tanzawa's flashback. Enraged by the lack of money Serina earned in one day, he chokes her and demands that she go back outside to prostitute herself. In order to defend his mother, Atsushi hits the back of Kousuke's head with a bat, successfully making him release her. Unfortunately, Kousuke beats Atsushi and has sex with Serina in front of him.

In Chapter 151, Atsushi returns home to find his mother telling Kousuke that she is pregnant with his child. Since Serina cannot continue prostituting if pregnant, Kousuke berates her harshly and repeatedly kicks her in the stomach. This time, Atsushi uses a kitchen knife to stab Kousuke in the back, but the wound is too shallow and Kousuke beats him unconscious.

A few days later, Kousuke takes a walk alone, complaining about the police and having to get ten stitches due to the stab wound. As he contemplates also prostituting Atsushi, he suddenly encounters Minagawa Jousuke underneath a bridge. Jou asks him to leave Serina and Atsushi alone, but Kousuke refuses. Kousuke halfheartedly encourages Jou to study and gain status and power. He then predicts that Jou is going to use a stun gun and a knife to stop him by force. Confident in his ability to defeat Jou, he prepares to fight.

By the next morning, however, Kousuke is found dead underneath the bridge with his throat cut, murdered by Jou.