Red String of Fate: by 0taku_g1rl

Eren and Mikasa met first when they were 5 years old in kindergarten. They became friends real quick and had it wonderful together.
Until one day where Mikasa's parents got a job another place and they needed to move.
Mikasa and Eren were then separated from when they were 9 to 15.
That's when they meet again at high school.
By that time they barely recognize each other, but somehow does short time after.

But it all ends up with a dark twist.

This story can contain trigger warnings as suicide thoughts, depression, disorders and darkness