When Yuuya and the others arrive in the Fusion Dimension, Academy soldiers appear before them with Dennis in tow! And while he stands there shocked, someone attacks Yuuya... It's Kachidoki!! Having lost to Yuuya at the Maiami Championship, he's come to the Fusion Dimension to get his revenge. Yuuya accepts his challenge, hoping that this time he'll be able to show Kachidoki that Duels should bring smiles, but...
You'd better not lose, Yuya!