Inside the elevator that suddenly stopped with a loud noise, a man appeared in what should have been an empty space. New nurse Nana Mi Kawakami repeatedly pressed the emergency button, but it didn't respond, and the man showed no reaction. She tried speaking to him, but he barely answered, and gradually, unease began to grow within her. Then, the interior of the elevator grew even quieter, and an ominous atmosphere filled the air, as if something was about to happen.