Three years since her social debut, Countess Melphiera is plagued by false rumors due to her unusual hobby, hindering her chances of finding a fiancé. Her stepmother, who dislikes her, threatens to send her to a convent unless she secures a fiancé within a year. Desperate, Melphiera attends the autumn banquet, only to find herself alone and attacked by a magically corrupted monster. Rescued by the infamous 'Mad Blood Duke,' Galbraiths, she discovers he's intrigued by her fearlessness. He not only understands her hobby of consuming monsters and mutated plants but also offers to help her pursue it. Suddenly engaged, Melphiera wonders if she's being tricked. This is a love fantasy following a gluttonous countess who seeks delicious ways to consume monsters for her people and a mad blood duke who continuously eliminates monsters plaguing his territory. Their journey to happiness begins amidst malicious rumors and the challenges of finding a suitable partner.