Battle Angel Alita: Last Order, Vol. 3 - Angel Eternal

Alita joins her arch-enemy, mad scientist Desty Nova, and two nasty replicants of herself on a journey to Ketheres to rescue her old friend Lou's brain, which is part of a vast array powering the computer known as "Melchizedek." In Ketheres, the hapless cyborg and her unsympathetic companions promptly become embroiled in a war between artificial worlds. Their hosts have the secret of immortality, but how human is someone who can live forever?