On that day four years ago, we made a mistake just once... Since Seika lost her husband eight years ago, she has been living with her only son. Her memories of four years ago come to mind as she nears the end of her son, who is going far away with her job. When she heard her son's wish for college entrance celebration, she was asked for a body, and she piled up her body only once. Her hot spring inn makes her abandon her everyday reason, and in her extraordinary life, Seika releases her instinctive libido. And today she's again, she's making the same mistakes...
