This direct sequel picks up where Battle Angel Alita left the cyborg warrior Alita for dead. Desty Nova's nanotechnology revives her inside the floating city of Tiphares, and she wakes into no paradise: the citizens have just learned what the city does with their brains, and Tiphares has come apart around them. Alita sets out through the wreckage after Lou Collins, the friend she lost, and after the truth about her own erased past.