慧子（葉月里緒菜饰）一出世就被黑社会老大收养，但不幸在其六岁时全家惨遭灭门。老管家将其托付给组织里的女杀手黑天使（高島礼子饰）。在黑天使得保护下，慧子平安到达美国洛杉矶。14年后，慧子带着一身绝技返回日本，一面寻找当年的恩人黑天使，一面计划报复仇人。却不知自己正在不知不觉中走入一个圈套。东京的地下社会，被毒品、酒精与性、暴力所弥漫，她陷入网中，不可自拔。Ikko, the six year old daughter of a yakuza gang boss witnesses the brutal slaying of her parents and is only saved from sharing their fate by an underground hitwoman who goes by the nom-de-guerre of "Black Angel." Years after escaping to America, Ikko returns to Tokyo as a young woman. She adopts the name "Black Angel" and is out for revenge.