Tatsuo Oosugi, a troubled working class teenager who frequently assaults his mother for divorcing his father and neglecting him, decides to join the yakuza to raise money for his future marriage with Kayoko Matsuyama after suffering burnout from his various low-paying jobs.

There, the boys insert various foreign objects into her vagina, beat her and force her to lie to her parents over the phone that she is staying at her friend's house.

Despite the horrific abuses, Misaki finds the courage to escape the house twice, with the help of Takao's mother in the second instance, but is nonetheless caught and punished by having her leg doused in lighter fluid and burned.

After returning from the sauna, the gang discovers that Misaki has succumbed to her injuries after she is unresponsive to Tatsuo putting a lit cigarette near her nose.

The film ends with an illusion of a crying Tatsuo in a dark room as he fails to make a mangled bird fly from his hand.