His boss, "Oichi," who worked for a major trading company, had an affair with him. They become more and more attracted to each other. However, 'Oichi' who has a wife and child always return home after an affair. They had not spent the same night yet. The first hot spring trip...The first night of spending only two people. An affair between a man and a woman who interacts passionately with each other in a bathy retreat away from everyday life.