When his father remarried, Yuu to a boarding school. His student life came to an end in the blink of an eye, and on the day of his graduation ceremony, his stepmother Kanna, whom he had always admired, came running up to him with a smile. Yuu couldn't hide his joy at the visit of the person he loved, so that night, they celebrated together... They talked all night, and their feelings came together. Kanna gave him a gentle kiss, saying, "A present for you , Yuu, now an adult." And so, he took another step towards adulthood.