A few years into their marriage, the Shiraki couple decide to have a child and come to a hot spring resort renowned for its fertility baths. They soothe their fatigue in the open-air bath, but the indifferent husband falls asleep early from exhaustion from driving. Unsatisfied with their precious baby-making trip, Yuko lies on the bed in a state of discontent... In the middle of the night, in the quiet of the room, someone's footsteps can be heard faintly. Suddenly, Yuko wakes up to see a man wearing a Tengu mask. The man tells the surprised Yuko, "This is a festival," and begins to play with her body, not minding that her husband is next to her...