Yui, a pure married woman with no experience in masturbation, has been married for four years and is suffering from a severe lack of sex. Her innocent body is thoroughly introduced to intense, adult pleasure. Pregnant and living in Yokohama, she becomes highly sensitive to sex, moaning lewdly and climaxing intensely, so passionately that she forgets she's even carrying a child. Tormented by her husband's powerful thrusting, she is completely overwhelmed by the pleasure.