Branch Era 2342. Humanity has fractured into two factions: Selene, controlling the Moon and what remains of Earth; and Radon, governing the space colony Cage. Led by Mother Roentgen, the Radon Daughters have ordered Genome Control to create the World-Egg — a weapon to end Earth's reign and birth a new universe. Cage is now positioned above the planet, ready to launch. Deep inside it, a pilot awakens in the cockpit of the Halcyon, an experimental Radon gunship. A Voice echoes in the newly-hatched pilot's mind: destroy the World-Egg.