One day, a man is brought to the hospital where Rei, who has a reputation as a beautiful surgeon, works. In order to fulfill her mission as a doctor, Rei tries her best to treat him and save his life, but the man is actually the worst ●●● demon. One day, the man recovers and finally takes care of Rei at the hospital. Furthermore, Rei's weakness is seized by the man, and she is drawn into the worst ●●● spiral.