Of the five faumen tribes, the cat-like Norzen are viewed as dangerous outcasts, rejected by many for the sins of their most infamous member: the heretical Cacovis. Kai is a young Norzen apothecary serving as a member of the Hunter Corps, dedicated to culling dangerous beasts which wander into the Grand Duchy of Livoria.
After a hunt goes terribly wrong, Kai is left the sole survivor of his squad while a rebel faction within Livoria, the Liberation Army, desires the eradication of all faumen and fans the flames of civil war. Now on the run, Kai finds himself responsible for leading a pair of local women to safety amid the turmoil, one of whom actively mistrusts him. Joined by other outcasts on their journey, it becomes difficult to differentiate friend and foe as the Liberation Army continues its advance. Worse still, Kai remains haunted by Grimghast, the beast that killed his squad, leaving him torn between revenge and protecting his new crew.
As centuries-old tensions boil over and shocking truths about his past are revealed, Kai and his rag-tag group fight to not only protect Livoria's future but also save themselves from enslavement or death.