Attack on Titan - Vol.01: Kindle Edition

Blurb:
THE DESPERATE BATTLE BEGINS!

For the past century, what's left of mankind has hidden in a giant, three-walled city, trapped in fear of the bizarre, giant humanoids known as the Titans. Little is known about where they came from or why they are bent to consuming humankind, but the sudden appearence of an enormous Titan is about to change everything...