Her husband is busy with work, and even on their wedding anniversary, work takes priority... At that time, Nanami receives a call about a class reunion. When Nanami finds out that her ex-boyfriend Tsukasa will be there, she decides to go out of nostalgia. On the night they were reunited, a sudden heavy rain fell... Then Tsukasa suggested, "Let's take shelter from the rain at a hotel." A housewife who vowed to remain chaste upon marriage is reminded of her past as a slut while having sex with her ex-boyfriend, and ends up having sex all night long in this depressing NTR drama!