米子（天海佑希饰）代号黑色天使，是一名职业女杀手，杀人手法干净利落，冷血无情。然而在其心底却有着年少时的一段珍贵回忆。庆川家族由于争夺地盘发生内讧，米子奉命追杀庆川，躲闪之余，一名路人被保镖（大和武士饰）误杀。路人之妻报仇之际又借米子之手杀了庆川。一直在幕后操纵的松田，想让三人自相残杀。却不知造化弄人，三个仇人机缘巧合聚在一起，一起向松田的黑帮势力发起进攻。Tokyo Shock的又一经典延续，动作片美感十足。

Ran (Shimamura) comes to Japan, and makes an immediate impression by assassinating a Yakuza boss and his associates, while they dine in a restaurant. Escaping the scene, she hides out in the restaurant owned by Yoichi (Yamato), and thanks him for covering for her with her body. About three hours later – or maybe it just seems that way – she moves on with the rest of her mission...

1997年，超级电脑炼金之星预测到地球将会破坏招来体所消灭。得知此事后人类用炼金之星的研究技术组成一个全球防御组织GUARD，而XIG则是GUARD的战斗力量。