Immediately after his father remarried, Yuu left his parents' home to continue his studies. He enjoyed a fulfilling school life, and finally his graduation ceremony came. On his way home, his stepmother Ikumi came running up to him with a smile. He had been traveling alone, harboring a secret admiration for her, but the unexpected reunion rekindled those feelings. That night, they celebrated their graduation together, and Yuu saw Ikumi off to the hotel. As they talked endlessly in the room, Ikumi kissed him and said, "This is a present for you, Yuu, now an adult."