Summary
Bam is a boy who has only known a dark cave and a light he couldn't reach. That is, until one day a girl named Rachel appears through the light and they become close friends. Rachel has to leave Bam to climb the Tower, so Bam decides to follow her and see if he can make it to the top.
Bam is special because he's an "Irregular". This means he can open the Tower's gates by himself, and that's something that hasn't been seen before. He sets off on his journey to try and reach the top with Rachel and to find out what the Tower can grant him.
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