There's nothing wrong with Adelaide's life. There's nothing wrong with being cheated on. After all, half of marriages end in divorce and most end from infidelity. There's nothing wrong with getting addicted to an otome game. After all, everybody has something they're obsessed with. There's nothing wrong with reincarnating as the villainess instead of the heroine. After all, the villainess is richer and more powerful. There's nothing wrong with the villainess chasing after one of the love interests. After all, it's not like he's the canon route. There's nothing wrong with Ophelia's life.
Cent, short for Crescent, recently finds out that she is the daughter of the great demon, Beelzebub, when she got a pair of horns on her eighteenth birthday instead of a pair of skating shoes. She finally got her answer why she never once felt that she belonged, turns out, she is not entirely human. When her estranged dad came knocking to take her away from her wretched foster life, Cent grabs the opportunity to be with her only ‘living’ family. But, he is called the great demon for a reason. After disturbing her life, he drops her like a sack of potatoes in front of the gloomy gates of Transylvania Academy. Turns out, before her great demon dad can accept her, she still needs to prove herself worthy. Does she have what it takes to carry the privilege as an only child of a great demon? Does she have what it takes to be a monster?