Akira left his hometown for Tokyo to attend university. Three years of student life passed in the blink of an eye, and the day of graduation arrived. On the way back with a friend, he unexpectedly saw his stepmother Ryo smiling at him from afar. Akira couldn't hide his joy at seeing the mother he had missed for so long. Ryo suggested they both go out for a drink to celebrate Akira's graduation. Because he was very happy, Ryo drank a little too much, so Akira had to take her back to her hotel. In fact, Ryo had known about Akira's feelings for her, not just as a mother-son bond but also as a romantic attraction. And as a graduation gift, she gave him a passionate and intense kiss, allowing him to see her as a woman and to make love with her...