Anna, a woman transported to another world, finds herself the target of a persistent demon's affections. This otherworldly suitor possesses different individuals to propose marriage to her repeatedly. Thanks to her unique ability to see through deceptions, Anna is deeply moved by the demon's efforts but continues to refuse him gently. She can't help but wonder when he will finally give up his pursuit. Meanwhile, in the depths of the underworld, Rothgar, a Grand Duke of the Abyss, has made a wager with a fellow demon. He must secure marriage proposals from one hundred human women within six months. To his surprise, the very first human female he encounters in the mortal realm flatly rejects his advances. Undeterred, Rothgar tries again. Perhaps she doesn't fancy the handsome son of a city lord? What about a young, brilliant wizard? Or even a noble, pure-hearted son of the holy temple? Yet, to his increasing frustration, the human woman rebuffs him every single time! Rothgar's pride is wounded, and he becomes determined to win her over at any cost. As the months pass, his obsession grows, and his tactics become more desperate. Six months later, in a startling turn of events, Rothgar finds himself groveling at Anna's feet. He kisses the back of her foot, his crimson eyes glazed with adoration as he pants, "Please, punish me for my insolence..." Anna stares down at him in shock, thinking to herself, "Oh no... When he snaps out of this, I'm doomed!"