Shinji and Masaru spend most of their school days harassing fellow classmates and playing pranks. They drop out and Shinji becomes a small-time boxer, while Masaru joins up with a local yakuza gang. However, the world is a tough place.

Yumi is a woman who works as a prostitute in order to enter medical school. A yakuza rescues her from a customer who dies on his stomach, and they fall in love. The yakuza goes to jail, and five years later, when the yakuza is released, he tells her he is quitting the gang and lives with her. One day, the woman is kidnapped by someone, locked up in the basement of an abandoned building, and raped.