Miki married Shinji, the father of her best friend Sachiko, despite their age difference. However, Shinji's overseas transfer was decided, and since Sachiko had agreed to it, he suggested they live together, leaving Sachiko behind. That night, Miki witnessed Shinji embracing Sachiko's voluptuous body. But it was a passionate forbidden embrace between a man and a woman! Where will this complicated family situation ultimately lead?