Astral's been unable to leave since Yuma Dueled Shark, so, despite his reluctance, he's begun living with Yuma. At an inconvenient time, Akari Tsukumo has trouble when her PC she uses as a stay-at-home reporter crashes. When her big scoop is deleted as a result of a system down the city suffered, she orders Yuma to find an alternate scoop she can use for another manuscript. When Yuma goes into town, the traffic lights go nuts, causing downtown to fall into chaos. Yuma looks for the criminal who spread the computer virus that caused all this chaos.

A suspicious shadow is trailing Yuma. It seems someone has been after Yuma, and their identity is the unassuming girl Cat-chan from Yuma's class. Yuma and Kotori fall into Cat-chan's trap. To rescue Kotori, he's going to have to Duel. Astral is cautious of the strange vibes he's getting from Cat-chan, especially with the strategy of her "Transforming Cat Deck"!