The Synchro Dimension is the worst of them all
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The revamped version on what would happen if Yuri and Yuya were swapped at the age of seven. See how Yuya takes Yuri's place at Duel academy and Yuri takes Yuya's as the founder of pendulum. (This story is being posted from my Fanfiction.net account).
This is basically nothing like the original or the canon, that dies at the end of chapter 7.