Wataru is asked by his friend's mother, Juri, who runs a beauty salon, to be a trial monitor. He feels nervous and excited about his first beauty treatment, but... Perhaps the stimulation is too strong for the virgin Wataru, and he can't help but get an erection. Then, upon learning that he has never had sex, Juri teases him by teasing him about his sensitive parts... Wataru, who has discovered the seductive eroticism of an adult woman that he cannot experience with a young woman, becomes addicted to the pleasures of beauty treatments...