Eris no Seihai

Constance Grail lives by her family's creed: honesty above all else. That virtue offers little protection when her fiancé's lover frames her for theft before a room of nobles willing to accept the lie. As her reputation collapses, her plea for help is answered by the ghost of a woman executed ten years earlier: Scarlett Castiel, the infamous "villainess" who never learned to fear anyone.

Scarlett temporarily possesses Constance and turns the accusation back on its author, then names her price. She was executed for attempting to poison the princess, a crime she insists was arranged to destroy her. As the only person able to see Scarlett, Constance becomes her partner in investigating the nobles and secrets surrounding the execution. Every answer they uncover brings them closer to people whose lives now depend on the truth remaining buried.