Eris no Seihai

Constance Grail, the daughter of a viscount, is an unremarkable girl known only for her sincerity. At a ball, she is wrongfully accused of theft and loses her fiancé to an unknown thief. As she faces unjust punishment, a ghost named Scarlett Castiel appears and offers her a deal. Scarlett, once a noblewoman celebrated for her beauty and charm, was executed a decade prior for her crimes. After Connie agrees to the proposal, Scarlett possesses her and turns the situation in her favor, rescuing Connie from her fate. However, making such a bargain comes with consequences, as Connie soon discovers she is now bound to a vengeful spirit determined to settle old scores.