Due to his father's remarriage, Kei, who is the same age as him, becomes his stepmother, making his son's heart race. In front of such a son, Kei provocatively shows her sweaty crotch or makes lewd appeals. The son picks up Kei's pubic hair that had fallen to the ground and tries to masturbate in his room while smelling it. Suddenly, Kei appears. Though flustered, the son confesses that he is captivated by Kei's pubic hair.
