The Holy Grail of Eris

Eris no Seihai: Kon'yaku Haki Sareta Reijou wa, Kidai no Akujo ni Tasukerareta Daisho to shite Fukushuu ni Tsuki Awasaremasu
エリスの聖杯 ~婚約破棄された令嬢は、稀代の悪女に助けられた代償として復讐に付き合わされます~
Eris no Seihai - Kon'yaku Haki Sareta Reijou wa, Kidai no Akujo ni Tasukerareta Daisho to shite Fukushuu ni Tsuki Awasaremasu
O Santo Graal de Eris: As Fábulas
ผีนางร้ายจับคู่สาวซื่อ รื้อคดีใหญ่ (SIC)

Adaptation

novel
2019
Publishers:
and 2 more
As a viscount’s daughter, Constance Grail is an ordinary girl whose only notable trait is sincerity, leaving her with no real options when someone steals her fiance and falsely accuses her of petty theft at a ball. While Connie awaits her undeserved punishment, a ghost appears to offer a bargain. The spirit is none other than Scarlett Castiel, a noblewoman once praised for her beauty, lineage, and undeniable charisma-and executed some ten years earlier for her wicked deeds. When Connie accepts this proposal, she is possessed by the infamous spirit who instantly turns the tide on her tormenter, thus saving the hapless girl from her miserable fate. It’s never wise striking a deal without knowing exactly what you’ve committed to, though...or you might find yourself bound to a ghost dead set on revenge against her own enemies! (Source: Yen Press)