Yuu went to a boarding school and lived alone. His fun student life finally came to an end, and he finally graduated. On his way home, filled with excitement and anxiety for his new beginning, he saw his stepmother, Shiori, running towards him from afar, waving and smiling. He couldn't hide his joy at receiving the congratulations from the woman he had admired ever since they first met. Then, as he nursed Shiori, who had gotten drunk at the graduation celebration just the two of them, she said, "I'm so happy..."