Returning to Tokyo for the first time in a while, SAYURI invites her boyfriend, Nobuyuki, a pilot trainee, to a luxury city hotel. She warmly smiles at the energetic, childlike Nobuyuki, treating him with sisterly affection, her presence radiant. Even when he begs for a blowjob, she envelops him with tenderness. However, their relationship soon comes to a sorrowful end. Quietly watching the scene was a man—Hosaka, a cleaning staff member. Left behind in the room after Nobuyuki departs, Hosaka and the lonely SAYURI find themselves alone. An erotic story between the two begins now, unfolding within the urban confines of this private space.