Daughter of the hospital director, Sachiko is a gentle girl who is weak to pressure and will give her hospital boyfriend a handjob in his hospital room if he begs her to. One day, her father makes a medical error and her father's friend, a doctor, uses it to blackmail her and play with her body. Blowjob, titty fuck, fingering, cunnilingus, merciless creampie sex. The doctor's brutality continues, and finally, while her boyfriend is asleep from the drugs, he squeezes her big breasts next to her, makes her cum over and over again, and forces her to have sex with him and cum inside her.