Naoya, who is about to take college entrance exams, spends his days absorbed in nothing but senbei. One day, Rie, a friend of his mother's, came over to play. Naoya realized that her face seemed familiar somewhere, and he discovered that she was Yuko Kawakami, an AV actress! She silences Naoya's questioning with lewd temptations, but Yuko, who becomes obsessed with young penises, escalates the situation.