Nozomi, who lives with her brother-in-law and his wife at her husband's parents' house, has a 5-month-old son and leads a fulfilling life as both a wife and a mother. One day, while she is breastfeeding her son in the living room, her brother-in-law, Katsu, comes in. Katsu can't take his eyes off Nozomi's swollen breasts as she breastfeeds... In fact, her brother-in-law, who has always been kind, has an extreme love for breast milk. Not only that, but he also has a rather peculiar sexual fetish for anal sex, preferring vaginal sex to anal sex. What will become of Nozomi, whose anus and nipples are now being targeted everywhere in the house, in the living room, dining room, and bathroom?