Well apparently, it's exactly what Red thought, it is an almost *exact* copy of The Long Walk.
Or it's an *exact* copy of Battle Royale?
Kids killing kids in literature is nothing new though, The Lord of the Flies is a prime example, neither are dystopian societies killing each other via The Lottery for that matter. Is it plagiarism when as societal group we are exposed to the predominantly same influences? Something to bake your noodle later on.