I’ve been calling this “Their Story” though I know the title just isn’t what it needs to be.
This story is a third person omniscient tale about two kids, best friends since kindergarten, who refuse to be parted when one has to move away. Their plan is simple, run away. And they do. Their journey takes them from young second graders all the way into early adulthood. How they survived and struggled, how they stayed together to the very end.
Not sure if this would be Literary fiction, but it’s the best classification I have for it.