The Holy Grail of Eris

Nevertheless, she resolves to go through with the marriage for the good of the family.

During a ball hosted by a fellow noble, Constance meets a mysterious, alluring woman hovering at the edges of the room. She encourages the woman to enter the ball before losing sight of her. Not long after, her fiancé's lover confronts her with accusations of theft. Facing the ruin of her reputation, Constance pleads for help. In response, she is possessed by the woman she met earlier, who turns out to be the ghost of Scarlett Castiel, a famed villainess. With Scarlett's quick wit and intimidation, Constance is saved, and her engagement is annulled.

In return for her aid, Scarlett enlists Constance's help in investigating the circumstances leading to her execution 10 years prior. Although she was charged with attempted poisoning of the crown princess, Scarlett claims she never did such a thing. Constance agrees to uncover the answers, although her efforts will be scrutinized by the figures who once knew Scarlett and might prefer the truth remain buried.

[Written by MAL Rewrite]