Married for seven years, the Shirakis enjoy a happy, peaceful relationship, but recently Yuko has become obsessed with fishing, which has Yuko feeling a bit frustrated. At that time, her subordinate Hirai is introduced to her as his fishing mentor. The husband is in a good mood after catching a lot of fish, but he gets drunk, leaving Yuko and Hirai behind. Attracted by Yuko's unconscious charm, Hirai is unable to suppress his carnal desires, which have been inflated by alcohol, and attacks Yuko. Despite resisting Hirai's powerful and intense caresses, which he makes with his youth and energy, Yuko's whole body is melting with pleasure...