Birds locked in thier cage

Their wasn't much hope with the Wall's keeping out the titans other then the Scouts that killed as many titans as they could on expedition's but how many more life's needed to be lost before they reached their goal? Well, that wasn't much of a problem for the Princesses of the kingdom was it? The oldest of the Princess wanted to go and help as much as she could even learn the way's of her people but she and her sisters wasn't allowed to step a foot out of the castle's Yard but what if their was a bigger matter at hand with the Princesses? one that needed the Survey crops to come and protect them? What if the princesses are Humanity's last hope? And will love , hate and other feelings blossom in her adventure?