The grim reminder

Petra's alive. How? No one knows, that's the problem. Her adventure has only just begun, and in a race of time she has to find her way back into humanity. And of course that includes dealing with a Levi fail-personator, a titan shifter, Corporal sexy himself and a rowdy bunch of recruits. How screwed is she? Or should I say, how will she survive on this cruel yet beautiful world?
Rivetra, ect pairings.