After the Titans break through the wall, the citizens of Shiganshina must run for their lives. Those that do make it to safety find a harsh life waiting for them, however.
Attack on Titan
From the director of Death Note comes Attack on Titan. Many years ago, humanity was forced to retreat behind the towering walls of a fortified city to escape the massive, man-eating Titans that roamed the land outside their fortress. This is their story.