Des:On that day four years ago, we only passed once... Since Kiyoka lost her husband eight years ago, she had been living with her only son. As she gets closer to saying goodbye to her son, who is going away for work, memories of her from four years ago come back. When she asked her son what he wanted as a gift for his entrance into college, he asked for her body, and she ended up having sex with him just once. Her hot spring inn makes her abandon her everyday rationality, and in her extraordinary life, Kiyoka releases her instinctive sexual desire. And she did it again today, she made the same mistake again...