Alternative
괴물 공작가의 계약 공녀 / Witch's Counterattack / The Monstrous Duke's Adopted Daughter
Leslie’s life as the youngest daughter of the Sperado noble family was always used for the betterment of her sister, Eli, who is betrothed to the Crown Prince of the kingdom. After a failed attempt to extract the black magic within Leslie by sacrificing her to transfer it to Eli, Leslie knocks on the door of the monster Duchess Salvatore and, battered, bruised, and desperately pleads for the Duchess to adopt her?!