Tokyo is a dark technopolis, a city of faceless chrome and cold marble. It is ruled by Nogi, a yakuza boss specializing in drugs and murder. He gained absolute power by executing the former boss and marrying his daughter, Chiaki. Only the mysterious Ikko, Chiaki's half-sister threatens him. Inspired by a legendary hit-woman, Ikko calls herself the Black Angel and plans to wash away her father's murderer with a deluge of blood.

Erotic drama depicts the psychology of a middle-aged woman who gradually develops a lust for a young girl whom she had envied.

The school Eiko attends has a motto of educating ladies, so the discipline committee members are no joke! Eiko is appointed to the discipline committee and begins patrolling. There, she sees her best friend Yoko entering a hotel in her school uniform, and a senior member of the discipline committee having an affair with a teacher. Then, she is attacked by someone...