In the year 2099, Earth undergoes a catastrophic shift, tilting its axis dramatically. This event triggers three years of relentless natural disasters, resulting in the demise of Earth's ten billion inhabitants. Only two million moon colonists survive this turmoil. As the chaos subsides, some survivors return to Earth to kickstart its repopulation, establishing seven new cities. Meanwhile, the remaining moon colonists, wary of their former inhabitants, erect a network of defensive satellites to confine them within the rejuvenated world.