Since childhood, Shota was raised by his father and grandmother in a two-family home on the top floor of a condominium they had bought together the year before his mother and grandfather died in a traffic accident. Last year, his grandmother passed away, leaving Shota and his father living together in the spacious house. His father decided to utilize the vacant rooms by turning the place into a shared house, and Natsu, a slender female college student with a prominent, sexy ass who had just moved to Tokyo to start university, became the first tenant. Suddenly living together with her, Shota—an extreme ass enthusiast—began playing mischievous pranks around the house, which eventually escalated into full-blown sex, culminating in creampie after creampie.