Worlds apart REWRITE

In the year - - - -, a boy who can't remember anything about himself or the past wakes up in a building underground, with another boy named Gray. He encounters a world filled with death, death walking in the form of robots. Gray helps him along the way, but an encounter with Gray's brother throws a huge fork in what was initially a smooth ride...

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Hi! This is a rewrite of an old story of mine. I hope you enjoy! Btw it's marked as mature because of graphic character death.