In Heartland, Yuma Tsukumo aspires to be the world's best Duelist. Despite this, he is not a good Duelist. When he ends up Dueling, Shark, a student known to have pro-level skills, odd things begin to happen and Yuma's story begins.

The Duel between Yuma and Ryoga comes to its conclusion. In order to take down "Leviathan Dragon", Yuma obtains a "Number" monster of his own, "Utopia".

The mysterious person posing as Robin around town was Fuya. Under the intolerable strain of being a hero, Fuya's heart has been dyed in darkness. Yuma challenges him to a Duel to save his soul. Robin, however, possesses "Number 83: Galaxy Queen". With it, he proceeds to summon one character after another from the TV Show. At first, Yuma and Astral were amused by this, but due to Galaxy Queen's almighty Monster Effect, they quickly grow impatient. To make things worse, Galaxy Queen, who currently possesses Robin, has taken on the appearance of Fuya's mother.

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"!

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