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Shinji secretly admires his father's new partner, Yurine. However, he tries to shake off those feelings and goes to a boarding school, but... Student life ends in the blink of an eye, and it's the day of the 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 their 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.