In a world where nobles stop at nothing to gain power, lying, manipulating, and extorting are commonplace. However, House Grail remains true to its principles of honesty and integrity. Constance Grail, the youngest daughter of the family, upholds these values, always acting with righteousness and aiding those in need.
But her moral compass becomes futile when her fiancé betrays her by being unfaithful. He and his new lover conspire to frame Constance, silencing her pleas for justice. No one believes her except for the spirit of the notorious Scarlett Castiel, who possesses Constance to turn the tables on her accusers. This intervention, however, comes with a price.
Scarlett was executed ten years prior for attempting to poison Princess Cecilia, though she maintains her innocence. Despite her blunt and ruthless demeanor, Scarlett would never commit such a crime. She seeks vengeance against those who framed her and demands that Constance, the only one who can perceive her, help carry out this mission.