The Demos are like a time bomb that takes upon the appearance of humans. At one point in their life, artificial demons will be unable to suppress their demonic energy and will become a monster with a convulsion. They are the artificial demons created from horrific atrocious experiments from the fallen kingdom of ancient Kounat. The duty is to execute those who have fallen into Hell Demos and protect their humanity. The execution is death to Hell Demos and life to the Demos.