Yuma challenges Professor Kitano, who is behind it all. Professor Kitano notes that each time he reduces his opponent's Life Points with "Electronic Computer-Beast Tera Byte" Astral's body weakens, causing him to slowly vanish! To make things worse, the Explosive Virus Time Bomb Ukyo has set is slowly reaching its countdown.

Tokunosuke steals Yuma's "Utopia", causing Astral to vanish. Tokunosuke had wanted the great power of Numbers, and Yuma tries to Summon "Leviathan Dragon" to fight back, but Tokunosuke's Trap Card takes even that away. When Yuma is pushed into a corner with his field, an unexpected monster will become the Trump Card of the Duel.

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"!

Yuma is having trouble in his Duel against Cameron, and the dangerous future of Tori encountering an accident is continuously approaching.

It's time for the World Duel Carnival Finals! But prepare for a world of twists and turns because the finalists will be dueling on a roller coaster! Can Yuma handle the ups and downs of the competition, or will he be sent for a loop?!

The World Duel Carnival takes a dark turn as the finalists descend into the Dragon's Den, a dark and dangerous duel track that will bring defeat for many a duelist!