Because her husband is physically weak, Hana always has to masturbate alone in the corner of the closet. Next time, her sister's son will come to stay at her and her husband's house. He will stay until he gets a job in the city. He had also liked Hana since childhood, and this time meeting him again made his feelings even greater. On the occasion of his uncle getting drunk and his aunt sleeping in the kotatsu, he immediately went inside, discovered the "mysterious cave" that he had always wanted, and finally fucked Hana even when her husband was by her side. ! Even though she knew it was wrong, the feeling of being "watered" after many months of being "withered" made Hana passionate. She wanted to enjoy more, wanted to satisfy her own desires. The two continuously fuck each other every chance they get, whether a day, a month or a year has passed, they still maintain this wrong relationship...