Letters to Ember

Ember, a lost teenage boy, struggling with the everyday life of an ordenairy depressed kid.
After his father left them, he went to live with his mother, moving out, which also means transferring school.
And the place sucks. It really does. Untill he writes a letter, and forgets it in the back of the classroom, because that's the start of a friendship forming out of letters being written towards a mysterious stranger.