Violated by father-in-law... beautiful wife

Riho, a wife who steals the attention of her sexless husband, Minoru, continues to have a physical relationship with her lover, Kazama. Riho's father-in-law, Shoji, notices that Riho is having an affair and confronts her, saying, ``It's your slutty mom's fault that we don't have an heir.'' Shoji forcibly rapes Riho as if to teach him the customs of his home. In the end, he threatens to spill his semen into the vagina of his son's wife, Riho...