After ten years of graduating, there was finally a class reunion, especially with the participation of the former homeroom teacher, to whom student Miku Maina had previously confessed her failure. That day, both Miku Maina and her husband attended together because her current husband was also a former high school classmate. While he was happily chatting with his best friend, his wife arrived. While interacting with his teacher, he suddenly received a phone call from his superior reporting a work incident. This forced him to immediately go to the company to work overtime until morning. to keep up with the schedule, leaving his wife and the fun behind. When the class reunion was almost over, Miku Maina was also drowsy from drinking too much alcohol. Seeing that, her old homeroom teacher immediately took her to rest in a nearby hotel. At this time, emotions rushed back. He had expressed his regret before rejecting her confession and he wished to make love to her for the first and last time to repay that regret. Throughout that night until the next morning, their fun did not stop...