The father-in-law is old, so Nao and her husband inherited the public bathhouse that he left behind. Because her husband is used to office work, managing the bathhouse while working is too difficult. Nao decides to help her husband manage the bathhouse. But because of this, the two of them rarely see each other. After work, her husband has to take care of his father, making Nao, despite being very sexually frustrated, unable to do anything about it. One day, Takahashi, a young and hardworking boy who works overtime and comes home late, regularly visits Nao's bathhouse. Even though it is past closing time, Nao still lets Takahashi in. Once, Takahashi fell asleep in the bathtub due to extreme fatigue, and Nao quickly rushed in to save him. She asked him to quit his current job and work for her instead. Takahashi agreed, and since then, Nao and he have been together often, and feelings started to develop between them. Despite knowing it is wrong, Nao's body craves for sexual satisfaction, and when Takahashi takes the initiative, although she cannot speak, her body desires to enjoy even more...