Yo attends a boarding school and lives alone. His happy student life is finally over and he has finally graduated. On his way home, he is both excited and apprehensive, looking forward to a new beginning. At that moment, he sees his stepmother Shiori running from a distance, waving and smiling. He couldn't hide his inner joy at receiving congratulations from this woman he had admired since he first met her. Then, when he breastfed a drunken Shiori at their graduation ceremony, Shiori said, "I'm so happy ......"