Naho, who has been married for 12 years, lives an ordinary but happy life surrounded by her family. She is invited to her school reunion for the first time in 20 years, where she meets her ex-boyfriend Takeda. Takeda was a man who was sloppy with women and ended his relationships in the worst way possible. However, Takeda has grown up and they end up reminiscing, missing the last train and spending the night in a hotel together. Takeda knows Naho's body inside and out, and his technique has improved, making her climax over and over again, rekindling their old passion...