It's been 3 years since I entered a boarding school. Yuu's fruitful student life has come to an end, and he is looking forward to starting a new journey. On the day of his graduation ceremony, it was his mother-in-law, Ayaka, who ran up to him with a smile on her face. Unable to hide her joy at being reunited with her secret crush after such a long time, she invites him to celebrate her graduation with him... The two of them talk to each other as if to make up for the time they were apart. Then, she gently kisses him and says, ``This is a present for you now that you're an adult.'' And he was once again climbing the stairs to adulthood.