"Until the day humanity falls." In the year 2020, Earth's magnetic poles disappeared and humankind was nearly wiped out by cosmic radiation. Within the span of a hundred years, living creatures began to mutate and devour each other while the remaining humans, numbering in the tens of thousands, struggled bitterly in their man-made bases. In the Abyss, home to the mutated xenogenics, there lived a sentient little mushroom. Because it...