 If you liked
X
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 ...then you might like
Yu☆Gi☆Oh! Zexal Second
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Conflict between the Earth Duelists vs the Seven Barian Emperors is reminiscent to that of the Seven Seals vs the Seven Angels.
Casualty count is pretty high that sets the dark mood of both shows and to the extent that the friend of the protagonists becomes his ultimate rival whose role is the opposite of his to determine the fate of the entire world at stake.
Both series have letter X in their titles.
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Recommended by WingZeroRequiem