In the near future 2149, a global catastrophe known as the "Great Annihilation" completely destroyed human civilization: Unknown cosmic rays swept across the earth, triggering violent movements of the earth's crust, reversing the magnetic poles, and 90% of The land has become a wasteland filled with radiation and rampant alien beasts. Air pollution prevents humans from being exposed to the outdoors for long periods of time. At the same time, the catastrophe gave birth to mutant beasts that merged machinery and biology. It also allowed the remaining top technologies to survive, giving birth to cyberpunk-style apocalyptic fortress cities and wasteland wandering forces.
