

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".