In a kind of prologue, a man covered in blood runs down the street, while a voiceover talks of the growing fear of living in Hong Kong.
Two parents ask the elderly policeman for help in finding their daughter. She has met a delinquent, has started smoking, going out with his friends and then she runs away from home. The boy turns her into a prostitute to fund his gang. But the girl leaves him when she meets a rival gang leader. The two gangs have a bloody battle, and most of them are slaughtered. The girl, who in the meantime has been found by the police, returns to her parents.