Yuu left his parents' home and is living in a dormitory at a private school. His meaningful student life is coming to an end, and it's finally time for his graduation ceremony. His parents can't come because of work, so on the day he was supposed to finish alone, his stepmother Rei came running up to him with a smile from across the street. On the night he enjoyed a graduation celebration alone with the girl he secretly admired, Yuu dropped Rei off at the hotel, and she kissed him tenderly, saying, "This is a graduation gift from me..." And so he took another step towards adulthood.