After graduation... a gift for your grown-up stepmother—. —Marina Hyakuno JUR-536

Yu's student life, spent away from home and living alone in his dormitory, is coming to an end, and he's about to graduate. Then, on his way home from the graduation ceremony, he reunites with his stepmother, Marina, who runs up to him beaming, and the feelings buried deep in his heart begin to stir again. That night, at the graduation celebration where it's just the two of them, a drunk Marina is taken to a hotel by Yu… Suppressing his escalating emotions, he tries to leave the room, but Marina gently says, "Accept this graduation gift from me…" and softly kisses him… And so, the boy steps onto the stairs of adulthood.