Dumon schickt Girag auf die Welt, um von Yuma alle Nummern abzujagen. Girag macht sich den Biker Fender zum Untertan und lässt ihn ein Duell gegen Yuma führen. Fender ist mit der Macht der Barian-Welt ausgestattet und zeigt eine überraschende, neue Fähigkeit: Die Chaos-XYZ-Evolution. Dieser Stärke ist Yuma kaum gewachsen.
As peace returns to Heartland City following the World Duel Carnival, Astral, who has collected 50 of the 100 original Number cards at this point, receives a strange vision from within Yuma's key. Meanwhile, an emissary sent by Dumon from the Barian World, named Girag, arrives in Heartland City, and brainwashes a gang of bikers to follow under him, using the spell card Rank-Up-Magic Barian's Force. His appearance revokes a reaction from Shark's sister, Rio. As Yuma, Shark and Tori go to check up on Rio, she utters something about someone planning to take something important, reminding Yuma of the words he heard when first activated the powers of his key. Just then, Yuma receives word that the biker gang's leader, Fender, has attacked his school, demanding he brings his Numbers. Fearing Astral could be put in danger, Yuma leaves his key with Tori as he heads to the school and confronts Fender. As the duel begins, Fender instantly summons his Xyz monster, Mechquipped Angineer. As Astral senses Yuma is in danger, Utopia sends itself over to Yuma, allowing him to summon it and deal some damage. Just then, Fender activates the spell card Rank-Up-Magic Barian's Force to perform a Chaos Xyz Evolution on his Angineer, to upgrade it to the Chaos Xyz Monster Mechquipped Djinn Angeneral, and steal Utopia's Overlay Units.
