An alternate universe where Eren has been living outside the walls as a titan for years until brought in by the Survey Corps. The events of the show happen at later dates, so all of the characters are in their late teens. The gate to Shiganshina had been kicked in by the Colossal titan. In doing so, Titans flooded the small city. The Armor had taken out the gate to Wall Maria. Humanity had lost its first line of defense. In the mess of it all, a curious Titan wanders inside.