A Duquesa Monstruosa e a Princesa de Contrato / Bản Khế Ước Với Nữ Công Tước Ác Ma / Canavar Düşes ve Sözleşmeli Prenses / Goemul Gongjagui Gyeyang Gongnyeo / L'enfant des ténèbres / La duchesse monstrueuse et la dame du contract / La duchesse monstrueuse et la princesse par contrat / La duquesa monstruosa y la princesa del contrato / Nữ công tước quái vật và công chúa hợp đồng / Putri Kontrak dan Duchess Monster / The Monster Duchess and the Contract Lady / The Monster Duchess and the Contract Princess / Witch's Counterattack / Княгиня чудовищ и принцесса по контракту / داچس هیولا مانند و شاهزادهی قراردادی / 怪物公爵と契約公女 / 魔女的逆袭 / 魔女的逆襲 / 괴물 공작가의 계약 공녀

The Speràdo family line possesses a secret: shadow magic. But it’s been 100 years since someone last wielded it. When Marquis Speràdo tries to sacrifice Leslie for her favored sister Ellie, little does he know that this awakens the power of darkness in her instead. To escape her family’s greed and abuse, Leslie’s out to make a deal with the Monstrous Duke: adopt her, and her powers will be at the duke’s disposal. Will Leslie escape her parents’ cruel grip, or succumb to their evil exploits?