For centuries, humanity have lived in ignorance behind the safety of their Walls, nearly oblivious to the roaming giants that wanted nothing more than to devour them. But even without the threat of titans, there was still conflict within the confines of the Walls. A young boy was found among the bloodied corpses of his family who were murdered for seemingly no reason. However, when a certain doctor decides to adopt the man, it opens up the boy's life to a whole new hell he could never have imagined.