The Oshikawa couple live in Tokyo, and their nephew Atsushi comes from the countryside to take an entrance exam. The couple welcome him warmly, but Atsushi, who is in his prime and wants to have sex, secretly borrows his aunt's underwear and masturbates in secret. His aunt witnesses the scene and tries to calm the flustered Atsushi down by saying, "Okay, Atsushi... I can't do it directly, but if you wrap me in your underwear, I can help you out."