Aise Mina wants to enjoy sex with her childhood friend and boyfriend Kenichi, but her body is so sensitive that even a touch to her nipples sends her mind blank. Hoping to overcome the problem, she visits what appears to be a beauty spa, unaware that it specializes in sensual training for women. She twitches and cries out during the initial examination, then repeatedly climaxes as the manager attacks her nipples with a vibrator and other toys. After being licked into an almost fainting orgasm, Mina awakens to a special lotion course, arches through orgasm after orgasm, and finally takes the manager's huge cock inside her. The treatment only makes her more sensitive, and her next night of sex with Kenichi becomes their hottest ever.