Yuu leaves his parents' home and goes to a boarding school. He successfully completes his studies and finally reaches his graduation ceremony. As he is sad to say goodbye to his classmates and heads home, he sees a woman waving and running towards him from across the street... It's his stepmother, Rinka, who wasn't supposed to be there. Yuu can't hide his joy at being reunited with the person he once loved. That night, as Yuu sends Rinka off after drinking too much at their graduation celebration, she asks him gently, "Will you accept this graduation gift from me, stepmother?" and kisses him...