2041, Earth. After being pulled into the planets atmosphere, the fall of the Freeport Space Station has led to the Great Cataclysm—an event that devastated the Earths environment. Left as a polluted wasteland, survivors go to war with their fellows to guarantee themselves resources; in the end, these scrimmages have erased the whole existence of humanity. Coincidentally, life still exists on a moon base. Although it is supposedly meant as an immigration outpost for the mission to explore Mars, it is soon turned into a city, both regulating and allowing its citizens to flourish. The lunar base, officially named The City of Eden, holds the hope of fully colonizing the moon.