Muzan Kibutsuji was the cruelest man on Earth—he was the Demon King who only wanted one thing, to conquer the sun. He hurt all demons, including his own daughter for his enjoyment and pleasure.

She was born to a human mother and Demon King father, and her father gave her his blood at a young age knowing her chances of survival would be high. He wanted to create the perfect demon in her.

But as time went on, she grew defiant to him—she hated him, and he hated her.