Nao, the daughter of the Kiritani family, is engaged to be much younger than her. On the day of their meeting, she is shocked at how young he is, but she is excited by his boyish fiancé, Ryohei, who has ulterior motives. While her parents are out, Nao lets him touch her G-cup breasts and pussy, and then she gives him a gentle blowjob on his erect cock. Unable to control their sexual desires, the two of them end up having an early wedding night...