Abyss Trap: The Bewitching Mistress Is a Siren

Nora, whose fortune was drained by her husband and stepmother working together, summons the deep-sea monster Kane with a blood contract. Transforming into a stunning mistress, Kane sets traps to exact revenge and win back the stolen wealth. Bound by the contract, the two fall in love while opposing the hunter organization that hunts sea monsters, fighting to survive in the abyss.