Because her husband is physiologically weak, Hana always has to masturbate alone in the corner of the closet. In the coming time, her sister's son will come to stay at her and her husband's house, and the boy will stay until he gets a job in the city. He had also liked Hana since he was a child, and meeting him again made his feelings even greater. On the occasion of his drunken uncle and his aunt sleeping in the kotatsu, he went inside, explored the "mysterious cave" he had always longed for, and finally fucked Hana even when her husband was around! Although she knew it was wrong, the feeling of being "watered" after many months of "withering" made Hana fall in love. She wants to enjoy more, she wants to satisfy her desires. The two constantly fuck each other every time they get the chance, no matter how a day, a month or a year passes, they still maintain this wrong relationship...