Exhausted from work and family life, Shinichi, dissatisfied with his marriage to Hitomi and their sex life, visits a brothel. There he accidentally reunites with his wife's friend Sarina, and they begin a secret relationship. Initially confused, they gradually desire each other more, and Shinichi struggles between his family and his desires. As time goes on, the rift with his wife who is busy with the family deepens, and he can't stop meeting up with his mistress.
