Nightmare Within Reality (An Attack on Titan or AoT and Fairy Tail crossover)

Rose Ackerman, a girl who's faced the ultimate and painful reality of life too young, someone who grew up as a thug in the Underground District with her elder brother Levi and his trustworthy friends Isabelle Magnolia and Farlan Church. As they were taken to be a member of the Survey Corps, a terrible fate was already planned out.

At a young age, death, regret and sorrow clawed its way into Rose's heart, destroying her from the inside. Though when she was twelve years of age, she was accepted into 104th Training Corps with raw determination and focus to graduate first in the top ten.

After this was achieved and she successfully survived the battle in Trost, training before another expedition was anything but ordinary. During immense pain, her body was dematerializing out of thin air, though she knew she wasn't dying.

The next thing Rose knew she was sitting in front of something called Fairy Tail.