Since graduation, a class reunion after many years. While rekindling old friendships with classmates she hadn't seen in a long time, Sayu had been thinking about her first boyfriend, Keiichi. And he felt the same way. On that day, they confirmed to each other that they were both married but somehow ended up exchanging contact information. The two who couldn't even hold hands back then are now adults. Keiichi is drawn to Sayu's mature and alluring body as a married woman. To distract herself from feeling neglected by her husband, Sayu accepts Keiichi and they make love repeatedly...
