Subway Serial Rape: Uniform Hunting 1987 one on netflix

On their way to school two sisters are raped by a gang of punks in full view of the passengers on the subway. When one sister commits suicide the other quits school and picks up a yakuza boyfriend who teaches her how to shoot. When the boyfriend is killed by his old gang the girl becomes a cab driver. With a .45 by her side she hunts for the punks who raped her and anyone else who deserves it.