Yale Sullivan finds himself in a dangerous world ruled by Beastbinders and monster pits, where everyone must awaken their Beastbinding talent at eighteen. Having failed his own awakening, Yale faces rejection from Renee, who boasts an A-rank talent and ends their relationship, offering him a bitter farewell. Struggling to survive, Yale encounters a cry for help and is attacked by a Vampire Queen, who drains his blood. This act unexpectedly binds him to her, activating a mysterious Beastmaster System and marking him as a new Beastbinder. Yale must now navigate this new reality with uncertain powers and looming threats.