Mieko, 60, and her husband Masao face a crisis in their marriage! Masao has a close relationship with his younger brother Masaaki, and the couple had been living a relatively happy life. However, Masao has a habit of cheating, and Mieko discovers messages between him and his lover. Devastated by the betrayal, Mieko is heartbroken. Learning of her pain, Masaaki feels sympathy and, in a moment of weakness, the two end up making love.