After more than a decade since graduation, classmates reunited for a class reunion. While rekindling old friendships, Saya couldn't stop thinking about her first boyfriend, Keiichi. And he felt the same way. That day, after confirming they were both married, they inexplicably exchanged contact information. The two, who once struggled even to hold hands, were now mature men and women. Keiichi was captivated by the allure of the mature, married Saya. Saya, feeling lonely due to her husband's lack of affection, accepted Keiichi, and they engaged in numerous passionate encounters…