Carl and Ellie have been best friends for as long as they can remember; they've been through thick and thin together and still made it. Well, actually not quite. At one point in their lives, they separated for a while, but now that they're teenagers, they have met again and they're back to being best friends. Not just that, they're off traveling the world together. Will this adventure lead to a journey that they will take together for their rest of their lives? Or will this adventure tear them apart once more, as they have been in their childhood?