Shiori Ihara, 43 years old. On a trip to a hot spring with her son... The air on the mountain path to the inn is unexpectedly cold, and her son's hands go numb... When the mother takes her son's cold hands and warms them up by placing them on her chest, her son becomes excited by the warmth of her breasts and seeks his mother's body on the street... The two of them then seek each other's bodies in the shade of a tree, minding the public's eyes...