Nao and her husband inherited their family's public bathhouse from their elderly, retired father-in-law. However, running it just the two of them was extremely busy, and before they knew it, the couple had no time for each other, and they continued to live lives of misunderstanding. Then, one day, Takahashi, a regular customer who always comes just before closing time, starts working at the bathhouse... As Nao spends more time with him than with her husband, she becomes intimate with him out of loneliness. Even though she feels guilty, her body remembers the pleasure of sex, and she moans as he penetrates her again and again in the large bath...