After three years at her dormitory school, graduation is finally here for Yu. She's filled with gratitude for her supportive and admired stepmother, Airi, who helped her through her fruitful student life. But then she receives news that Airi won't be able to attend the ceremony... On the day, a woman waving cheerfully from across the street turns out to be Airi! Overjoyed, Yu rushes over, and Airi smiles warmly, saying, "Let's celebrate our graduation together tonight, just the two of us..."
