A 30-year-old virgin man suddenly gets transferred to the city and, with no acquaintances around, temporarily moves in with his aunt, Kozue. Living together under one roof are his assertive cousin and his aunt—a completely new experience for him, having never lived with women before. Having barely ever spoken to women, he's overwhelmed with anxiety and tension. A few days later, one night, he spots a bra in the laundry basket and, unable to resist, masturbates with it. His cousin catches him in the act and yells at him in anger. Worried about his dejected state, his aunt visits him late at night. Sensing his unease, she opens up about his struggles with women. Mustering his courage, he confesses everything. Though slightly taken aback, she agrees to keep it their secret—then kisses him, pleasuring him with her hands and mouth. This first intimate experience profoundly shakes his heart.