A perverted doctor targets a woman who has a complex about her large buttocks and has come to get her pelvis adjusted. He performs an erotic massage on her, claiming to find pressure points that will make her buttocks smaller. Her sensitivity gradually increases, and she feels embarrassed at herself for not suspecting that it's just an ordinary massage. Eventually, she is made to lie on her back, and her hips and pubic bones are touched, causing her to twist her body and kick her legs as she feels her uterus being stimulated from the outside... These women experience the pleasure of vaginal orgasms for the first time.