Worried about his pregnant wife, Rin ka-san, his mother-in-law from the countryside, came to Tokyo. He thought that with her support, the couple's relationship would improve, but his mention of masturbation escalated his wife's anger. He was only suffering, which he couldn't bear, and was even given a ban on masturbation. A few days later, while feeling troubled, he accidentally saw Rin ka-san's naked body after her bath in the changing room. Worried about his unusual behavior, Rin ka-san listened to his detailed story...