Vengeance Is Mine (1988)

June and Amy are very close friends. One night, while driving to her boyfriend Tom's house for a dancing party, June is brutally gang raped by four men. The incident is discovered by Steve. June refuses to call the police. While the four men are waiting in ambush for June again, June kills one of them accidentally. After that, Amy is raped by the mob. Meanwhile, Steve is beaten to death in the hot fight. June and Amy swear to avenge Steve's death as well as their insults.