Gun Godz: The Thing I Protect

Humanity discovered a new energy source called the "Antimatter Core." They thought it heralded the beginning of a new world, but everything eventually fell into ruin. The new energy source that humanity had created to forge its future became the origin of a new kind of serum. Those who used the serum to unlock their body's potential became government agents. But the agents posed such a great threat that even more innocent people died. It leaves one wondering: should agents exist at all?