Maou no Musume, Sugoku Choroi.

Hell, the princess of the demon realm, has spent years nursing a singular, burning hatred for the hero who sealed her father away. When she finally s쳮ds in resurrecting him, her plan is brutally simple: drag him back to the castle, shackle him as her personal servant, and make his existence a living nightmare of torment and humiliation. For a daughter of the Dark Lord, vengeance is not just a duty—it is a birthright, and she intends to savor every ounce of his suffering. Yet from the very moment the hero opens his eyes, reality refuses to cooperate with her vengeful script. He does not grovel, nor does he show a shred of fear. Instead, she is met with an absurdly dazzling presence—an effortless, radiant charisma that seems to render the very air around him sparkling. Every cruel word she hurls, every petty punishment she devises, is met with an infuriatingly cool composure that somehow makes her heart race instead of simmer with satisfaction. As the would-be tyrant finds her own resolve wavering and her cheeks flushing at his most mundane gestures, Hell quickly discovers that the greatest enemy to her revenge might not be the hero at all, but the bewildering flutter in her own chest. In this twisted romantic comedy, the battle between demonic pride and unexpected infatuation is only just beginning.