Serina

Serina is the mother of Atsushi Tanzawa and worked as a prostitute for her boyfriend, Minamida Kousuke.

Plot
Serina is first introduced in Atsushi Tanzawa's flashback. After an unlucrative day of prostituting, she is choked and yelled at by Minamida Kousuke. She apologizes, blaming the lack of customers on the rainy weather, but Kousuke continues to strangle her. Atsushi saves his mother by hitting Kousuke in the back of the head with a bat, but is immediately beaten. Serina apologizes again for Atsushi's behavior and verbally wishes that he had not been born as Kousuke has sex with her.

At night, Atsushi discovers that Serina is pregnant with Kousuke's child. Kousuke, however, is furious because she can not work if she is pregnant and repeatedly kicks her in the stomach in a crude attempt at an abortion. Using a kitchen knife, Atsushi stabs Kousuke in the back to protect his mother, but he is beaten severely and sent to the hospital.

After Kousuke is murdered, Serina vists Atsushi in the hospital. Crying, she apologizes for what had happened to him and promises to find and date a kinder man who can support them financially. Atsushi sighs and passively assures his mother that he is fine.