Eris no Seihai

Most of the families seek power through lies, while House Grail values integrity. The youngest daughter of this family, Constance Grail, always tries to do good for others. Yet, her fiancé cheated on her and left her completely broken. No one believed her except the spirit of scarlet Castiel. Scarlet helped her to take her revenge, and now she uses Constance to seek revenge on those who betrayed her.