After graduation... This is a gift from your mother-in-law; you're an adult now. —Yuki Takeuchi JUR-570

Yu, about to graduate from boarding school and away from his parents, finds his life there coming to an end. He ran away from home to escape his feelings for his stepmother, Yuki, but on his way home from the graduation ceremony, he unexpectedly encounters her again, waving and running towards him. His hidden longing is rekindled. That night, at the graduation celebration where it's just the two of them, Yu indulges himself, taking a drunk Yuki back to her dorm. Although he tries to suppress his intense desire, Yuki gently tells him, "A gift for the grown-up Yu-kun," and kisses him…