Chu Yuen Fong, a typical Hong Kong high school girl, witnesses a traffic accident. Encouraged by her teacher, Mr. Wan, Chu decides to testify in court. As her testimony is unfavorable to members of the underworld, she is threatened for exchange of money. Unexpectedly, her good friend, Siu Chun comes to her rescue by providing her with the money. They become even closer friends. Under the persuasion of her boyfriend, who has underworld connection, Siu Chun turns to prostitution. Siu Chun suicides after she realizes that she is being used by his boyfriend. Chu determines to fight back...