This is a world of unprecedented aberration! A young woman screams in a park at night. Fresh blood spills out onto the hand of a man holding a knife.... It is the last day of school. Kishimoto jokingly tells Mariko that she should be careful with the newspaper of last night's murder in her hand and leaves. Yuri comes in, sees Kishimoto in the background, and says, “There was a murder last night. I tried to talk to him near the park where the murder took place, but he ignored me...” Yuri works as an accountant at the same school.

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.

A woman rejects her clingy female lover and pursues a female co-worker. The spurned lover plots revenge and the co-worker has a kinky secret.