Shinji was secretly longing for his father's remarriage partner, Yurine. However, as if to shake off that feeling, he goes to a boarding school ... Student life was over in the blink of an eye, and it was the day of the graduation ceremony. It was Yurine who ran up to him with a smile on her face. The two of them celebrate their graduation while exuding joy at reuniting with their favorite mother-in-law. Yurine kisses gently, "Graduation gift to Shinji, who has become a fine man-". And one more thing, he climbs the stairs to adulthood.