In a certain suburban apartment complex, the mysterious beauty of the older sister Nanako and the dreamy, tomboyish younger sister Kaori engage in daring, erotic play under the bright daylight. The story unfolds over a summer of love between the close-knit sisters, beginning with a mesmerizing lesbian anal sex scene. When their parents are away, the two indulge in pleasure together. They bathe together and perform fellatio. Later, they watch each other's solo play. The climax features a creampie sex scene with an older man who loves men's girls. The perverted old man gives the sisters some pocket money and then quickly leaves. Recommended by the No.1 influencer in the men's girl industry, the male girl writer Hirakawa Mirin (@mirinjoso).