Shinji secretly admires his father's new partner, Yurine. However, she tries to shake off his feelings and goes to a boarding school, but... His student life ends in the blink of an eye, and it's the day of his graduation ceremony. It was Yurine who ran up to him with a smile on her face. The two celebrate their graduation while exuding joy at being reunited with her beloved mother-in-law. Yurine gently kissed him and said, ``Congratulations on your graduation to Shinji-kun, who has become a fine man.'' And once again, he was climbing the stairs to adulthood.