Lider Lox suffers from Humanism. He has the wrong number of arms, legs and eyes. His blood is red - the exact kind that makes him look 100% human, which is unfortunate considering that he lives in the Citadel of Monsters.

To prove himself in a society that judges him for the number of his limbs, Lider Lox joins the Adventurer Guild - the job of which is to cleanse the world of human pestilence. Upon registration, Lider is forced into a Hunting party by two monster girls.

Their mission is to burn down human villages before they can grow into human towns.