'Bark' Of The Tree - AoT Fanfic

Imagine that there is another wall, another safe place for humans. One among few still standing... a tall red-wood tree with thick 'bark' and a hollow inside that provides a safe haven for all the people within.

Two fifteen-year-old girls, however, are chased from the safe haven and need to find a new place before they die. They find much more than what they had expected, a whole civilization, all within a system of complex walls.

They have found a new safe haven, but will the two weirdos be excepted.