Yuu has lived away from home while attending a boarding school, and now his happy student years end with graduation. On his way back, excited and anxious about the future, he sees his stepmother Shiori running toward him with a smile. He has admired her since they first met and is delighted by her congratulations. During their private celebration, Shiori gets tipsy; as he looks after her, she gently kisses him and says it is a present for Yuu now that he is an adult.