A certain general hospital in Tokyo admits cunning and ruthless criminals who have slipped through the fingers of the law. This is the workplace of Reiko Mikazuki—a beautiful and intelligent nurse admired by her patients and coworkers alike. However, behind her angelic face lies another persona: a merciless vigilante who deals out merciless punishment to criminals. Under the light of the moon, she delivers her judgments, but is she a beautiful angel in white, or a seductive demon with red-stained hands?