Last Man Standing

Aria had always lived a peaceful and normal life. In the outlier district of Shiganshina, everyday goes by like an average day should. Aria and her town is protected by the walls that surround her. That is until the year 845 comes around. In the year 845, humanity was forced to retreat within Wall Maria as a fifty meter class Titan appeared. Will humanity continue to survive, it will it fall to the hands of the Survey Corps?