The war on terror exploded, literally, the day Sarajevo was destroyed by a homemade nuclear device. The leading democracies transformed into total surveillance states, and the developing world has drowned under a wave of genocides. The mysterious American John Paul seems to be behind the collapse of the world system, and it's up to intelligence agent Clavis Shepherd to track John Paul across the wreckage of civilizations and to find the true heart of darkness—a genocidal organ.

Grey is a laconic trooper in a rough, futuristic military system which rewards success in battle with high pay and promotions, but only three precent of troopers live long enough for the final goal - citizenship and the chance for a life above the misery of most of the populace. Grey has managed to keep coming back alive, even earning the nickname Grey Death. But is the society he's fought for worth it?

In the year 123 of the Universal Century, skirmishes between the Federation government and the rebel group Crossbones Vanguard echo across Earth's space colonies. One of these small battles breaks in the hometown of young Seabook Arno, forcing him and his friends to flee and ensnaring them in the political turmoil that is quickly evolving into an all-out war. Seabook meets Cecily Fairchild, granddaughter of the aristocrat Meitzer Ronah, who seeks to create a new political power called "Cosmo Babylonia." Using the Crossbone Vanguard as its muscle, the Ronah family schemes to restore aristocratic rule and establish an economic system that will benefit the nobility, thus devastating the quality of life for the common people of the Earth Sphere. Seabook is tasked with piloting the Gundam F91, a mobile suit created by his mother, and must choose between protecting the status Federation's status quo or cooperating with Cecily to find a better way of life for all.