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. Out of joy, Ryo drank a little too much, so Akira had to take her back to the hotel. In fact, Ryo knew about Akira's feelings for her, which were not just maternal but also romantic. 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 to her...