Fire Beast - a magical creature created many centuries ago due to a magical mistake. He does not have his own body, he settles in the human. People have been passing it on from one to another for centuries. The beast endows its bearer with amazing abilities and makes it almost invulnerable. Someone considers him a curse, someone - a gift of fate. They hunt for him and dream of getting him, but he just lives from century to century and enjoys knowing the world. By pure chance, the Fire Beast settles in the most ordinary girl, living the most ordinary life, which the Beast immediately turns upside down...