Ichika, who lives with her husband and father-in-law, could not bring herself to like her father-in-law, who has a sneaky personality. Because of his personality, her wife ran away and her father-in-law is always erect because of his sexual desire. Ichika hates her father-in-law, but her husband suffers from erectile dysfunction, so she can't help but stare at her father-in-law's beautifully erect penis. Her father-in-law mistakes this for affection and plots to calm his erection by using his overly erect penis to rape his daughter-in-law at night. The unfaithful wife climaxes from unwanted sex with her father-in-law, whose perfect erection is incomparable to her husband's.