After taking a bath, my older sister, Misora, wanders around the house wearing only a bath towel. To her younger brother Naoya, it is a familiar sight, but Naoya's friend Masayuki, who was visiting, sees Misora and is stunned. Masayuki, who already has no immunity to women, involuntarily inflates her crotch as Misora relentlessly presses her body. Whether knowing her feelings or not, Misora invites Masayuki to come and stay with her tomorrow. And the next day, Masayuki visits the Aoki family with a heavy snort.
