The Fight For Survival (Levi Love Story)( Attack on Titan)

In the year 845, Wall Maria was teared down by the Colossus Titan and with it, the complacently of the humans that had lived peacefully within the walls for over a century. That day, humanity remembered the terror of being ruled by them. The humiliation of being kept in a cage. That was the day Maria Arlert and her twin Armin Arlert, lost their entire family while living at the first city that was hit: Shiganshina District. The sole survivor besides them was their grandfather, but just like everybody around them, he died at the hands of the Titans. From that day, Maria made a promise: she would kill and rid all the Titans from this world, even if she had to tear them piece by piece.
FIVE YEARS LATER
Ever since Maria and Armin were moved inside Wall Rose with their childhood friends,Mikasa Ackerman and Eren Jaeger, they had become the family that was taken from them,a painful reminder of their loss and their goal: joining the Scout Regiment so they could set out to finish what the Titans started the day they took out the wall. After graduating from the 104th Training Corps, they join the Scouts Regiment, but are presented with problem beyond their control which force them to question everything they have known: until now.
Levi has allowed his life to pass by him in a sea of blood: whether it be Titan blood or that of his own comrades. He believed his only reason for staying alive was to kill Titans,day in,day out. He has been forced to play the same tune, the same game until he meets Maria. Will she just be a fellow comrade, another pawn, or could she be something more ?
Maria has never allowed anything or anyone to get in the way of her revenge. But when she meets Captain Levi, she's touched by this lost soul and sees in him the same darkness and determination she sees in herself. Would he be just a fellow comrade, her captain ? Or will he be another reason to fight for survival ?