As the curtain falls on the World Duel Carnival, peace has finally returned to Heartland City. But now, emissaries from the Barian World, hostile to the Astral World, are aiming to steal the "Numbers" and Astral for themselves. In order to protect him, Yuuma, Kaito and Shark join together to combat the Barian menace, as they ultimately become involved in the Interdimensional War of two worlds.

Source: Yu-Gi-Oh! Wiki

Note: The first Yuu Gi Ou! Zexal series has been running at 7:30 p.m. on Mondays on TV Tokyo and five other stations. Yuu Gi Ou! Zexal II run in the 5:30 p.m. timeslot on Sundays (Aikatsu! idol card anime took over Yuu Gi Ou! Zexal's old Monday timeslot, starting on October 8, 2012).

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Prequel: Yuu Gi Ou! Zexal