Yoichi and the group go to a hot springs for free. They eat dinner with their host, who blames the lack of guests on ghosts. Yoichi and Ibuki volunteer to exorcise the ghosts and leave the inn. Immediately after, Ukyō and his sister Sakon release a sleeping gas throughout the inn. Yoichi and Ibuki fall into a hole after arriving at the entrance to a cave and are knocked unconscious. Yoichi wakes up to find Ayame next to him, who starts seducing him. Meanwhile, Ibuki wakes up and sees Ukyō, who tries to rekindle their friendship...