Yumi and her husband were on a trip together when they decided to visit a hot spring. However, the inn was a gathering spot for young, passionate womanizers who had come to enjoy the mixed-gender baths. Yumi, who had been in a sexless marriage, found herself captivated by the sight of a young man for the first time in ages. While soaking alone in the outdoor bath, she was drawn in by the intense presence of a young guy who appeared before her—and before she knew it, she was taken against her will. From that moment on, her heart was completely shaken.