Yuu, who had been living in a dormitory at a private school away from his family home. His meaningful student life came to an end as he finally faced his graduation ceremony. His parents couldn't come due to work, so he was supposed to spend the day alone. But on that day, someone ran towards him with a smile from across the street—it was his stepmother, Rei. She had been his secret admiration, and that night, as Yuu escorted her to the hotel, she softly said, 'This is my graduation gift for you...' and kissed him. Thus, he took another step up the stairs of adulthood―.
