In 2049, the "Red Moon Catastrophe" came, the earth's magnetic field was disordered, and mutated radiation swept the world: 90% of the land was covered by "radiated deserts", and mutant beasts and strange "aberrants" (monsters mutated by human radiation) were rampant; the only remaining "Oasis City" (a settlement like a steel fortress) relied on "energy crystals" to operate, but the crystals were about to be depleted due to core reactor failure.
