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 legend hit woman, Ikko calls herself the Black Angel and plans to wash away her father's murderer with a deluge of blood.Ikko's vengeance burns out of control as a web of intrigue, double-crossing, and mistaken identity comes crashing down around her.