After three years at a boarding school, Yu's fruitful student life is finally coming to an end, and he is graduating. Yu is filled with gratitude for the support of his stepmother, Airi, who is also a woman he admires, that has allowed him to get this far. However, he receives a message from her saying that she cannot attend the graduation ceremony... And on the day of the ceremony, a woman waves from across the street with a smile, and it is none other than Airi! As he runs up to her in joy, she smiles kindly and says, "Let's celebrate your graduation together tonight..."