Yonder

A babysitter rescues an infant after his parents are murdered by once-men infected by an imported disease. After ten years have gone by, the babysitter has raised the child and the two of them must continue on a quest band together with others who are not yet infected, to attempt to discover a cure for this disease that has taken so many lives.
The rescued infant, growing into a young man yet unaware of his true identity, must fend for himself in this post-apocalyptic world and try to sort out his priorities as to which is most important: his past, or his future.