Misuzu Akao works the night shift at a hospital. Coincidentally, during her shift, emergency calls from patients are very frequent. This strange situation raises suspicions among her colleagues, Rika Souhama and Mie Nakamaru. One night, Rika follows Akao to discover what's happening, and she is stunned to see what's going on in the private room where Mie's fiancé is located.