Beautiful Girl Hunter (1979)

One dark and stormy night Genpei, a middle age prison escapee haphazardly breaks into the luxurious mansion of Yasuhisa and Tokie, a wealthy and privileged couple and rapes the young wife in front of her bound husband. A year later, the son, Tatsuya conceived by the rapist comes into the world. His mother commits suicide. At the age of sixteen, he studies Nazi atrocities in history class, and feels the awakening of his inner brutality. The time has come. He launches a journey to let off a long-held grudge against the abusive foster father and to seek out a reunion with his genetic dad. He lures out his real father through newspaper ads and invites him to the secret torture chamber in the basement of the house where he confines abducted girls. Their feast of lust and perversion has now begun.