The Warped Ones (1960)
The Warped Ones is a 1960 Japanese Sun Tribe film directed by Koreyoshi Kurahara and starring Tamio Kawachi, Eiji Go, Yuko Chishiro and Noriko Matsumoto. It was produced and distributed by the Nikkatsu Company. The story concerns the young hoodlum Akira, his friends, their transgressions and specifically their revenge on the couple that got him sent to jail, a reporter and his fiancée, by means of assault, vehicular and sexual. When the fiancée finds herself pregnant by Akira she enlists his help with her finance who has become distant since the attack.
More at Wikipedia.