The sharp sound of shoes resonates in the hospital room late at night. Inside the door that closes stealthily, the figure of “Misuzu Akao” keeps its reward in the pocket and manipulates its imposing naked body. The days when Misuzu is in command, he is likely to receive an emergency call. Two of her companions, “Rika Souhama” and “Mie Nakamaru”, begin to suspect such a situation. The day of the night shift in which they were together in the rotation. Rika leaves his fiance Shinichi, the doctor on duty, to follow Misuzu in his rounds. While traveling a silent corridor, it arrives in a private room where Mie’s fiance has suddenly ill. At the end of the door, Rika sees…