After nearly a year living with her husband’s family, Ichika sees how different her serious, dependable husband is from his playful, early-retired father. The contrast reaches their sex life: her husband leaves her unsatisfied even after their baby-making sessions, forcing her to secretly soothe her own body. One night, as she masturbates quietly in the bathroom after sex with her husband, the door suddenly opens and her father-in-law walks in. He discovers her unmet desire and begins secretly giving her the pleasure—and repeated creampies—she cannot get from his son.