Geisters: Fractions of the Earth (2001)

A meteorite collision plunged Earth into apocalypse, and the remnants of humanity went in two different directions to survive. The aristocratic Dobias headed into space, while the earthy Shioru went underground. Centuries later, they returned to Earth's surface and are now fighting for control of the planet—that is, when they're not busy fending off a new species of predators known simply as Creatures.