By 2080, rising seas are visibly reshaping the world. No one expects the acceleration that follows. By Christmas 2097, habitable land has shrunk to a tenth of what it was. Governments abandoned liberal governance in favor of military dictatorship to combat sprawling crime syndicates. Survivors carved the remaining land into zones by quality of life: the Green Zone at the summit for the wealthy and government; the Blue Zone of steel reservations hundreds of stories below it; the Grey Zone of a miraculously unfloodable old city, its law long since dissolved; the Red Zone slum behind it; and the Black Zone — land that cannot support human life at all. A cyberpunk visual novel set inside the hierarchy of a drowned world.