In 2010 AD, hyper hurricanes spawned simultaneously across the globe, inflicting severe damage. Five billion people perished, reducing the global population to three billion. Existing economies and militaries were obliterated. Nations were encased in solid ice, plains submerged beneath the oceans, and the world was transformed drastically. Human civilization descended into a chaotic era. Poverty thrived outside these economic zones, and slums became widespread. The ruling class, calling themselves Logos, upheld their status through military force. They labeled the poor as Revenus, exiling them to live beyond the special economic areas. Some time has passed since then. Katsuragi Jo and Tsurasawa Jin flee from Phantom, an organization tasked with monitoring Revenus and suppressing renegade factions within the Logos, while taking with them a mysterious girl named Nobuto Sana. Many parties are interested in her, each driven by their own motives.