Mutants possess an extremely strong contamination ability. The slightest carelessness can lead to being inadvertently "influenced." This influence is typically imperceptible. However, each time a Professional advances, they directly confront the Endless Realm. At that moment, these influences can erupt, causing the Professional to degenerate and become a new Mutant.
Professional Mutants… The appearance of even one causes terrible losses.
In the Endless Realm, countless demonic forms, Evil Gods, and other such entities continuously scheme to affect the real world. These Mutants are the result of being influenced and corrupted by them; they are the Evil Gods' spokespeople in the real world.
In the real world, Mutants are the greatest enemies of Professionals—their threat level even surpasses that of Professionals from enemy nations.
