A female graduate student is having an affair with her mentor, a professor who assists her with her research. This leads to emotional instability. Her family consists of her father and mother, but her father has been living alone in Osaka for the past 10 years, returning only once a month. She somehow senses that there is a woman in Osaka. One day, her father is relieved of his duties by his company and returns to Tokyo. However, he brings with him a small child.