An Komatsu wins a hot spring trip at a local lottery shop. She decides to take her son, Yuki, along without telling her husband. In reality, she has been cheated on by her husband and is considering divorce. The real reason they decided to go on this secret trip was to sort out their problems... Little did she know that confessing this would lead her son, Yuki, to realize his long-hidden feelings of love towards his mother. As he becomes aroused by her, he begins to see her not just as a parent but also as a woman. Meanwhile, An finds solace in seeking physical comfort from her son, filling the void left by her hurtful experiences.
