The Roar from the Underground World

Nearly eight hundred years ago, the human world was thrown into upheaval and suffered an apocalyptic catastrophe. Guided by the sages, humanity’s ancestors found hope of survival, and their race endured in the world beneath the earth. But humanity had permanently lost the world that should have belonged to them: the world of rising and setting suns, starry skies and vast oceans; the world of changing seasons and ebbing tides; the world bearing the marks of thousands of years of human civilization and wisdom!

The mutants roaming the surface and the pervasive miasma stand in the way of everyone who hopes to return aboveground. As time passes, people seem to have gradually forgotten where their true homeland lies.