A class reunion where classmates gather for the first time in over a decade since graduation. While catching up with classmates she hasn't seen in a long time, Sayu has been thinking about Keiichi, her ex-boyfriend who was the first person she ever dated. And the same goes for him. That day, even though they had confirmed that they were both married, they somehow exchanged contact information. The two of them, who couldn't even hold hands back then, are now grown men and women. Keiichi becomes obsessed with the body of Sayu, a married woman who exudes a mature sex appeal. To ease the loneliness of not having her husband pay her any attention, Sayu accepts Keiichi and they make love many times...