It's already been 10 years since Yoshie separated from her husband and started living with her son, Susumu... As Susumu, whom she raised alone, grows up, her life, which had been hectic with work and childcare, begins to settle down. One day, Yoshie finds a rolled up tissue in Susumu's room and thinks, "Susumu has finally reached that age..." She feels both joy and loneliness at Susumu's sexual awakening, but that night, as she falls asleep as usual, the shadow of a man creeps up on her. Sensing a presence playing with her body, Yoshie wakes up with a start and sees...