It's Team Q4 against Team Unknown in the last round of the Japan Stage. Aichi's opponent, King Z, is revealed to be Jun Mutsuki, the King of Underground Fights, although Aichi does not immediately recognize him. Meanwhile, Misaki battles Queen Y and sees through her disguise. Queen Y is actually Yuri Usui from the defunct Team Caesar, and Yuri now uses the deck she originally had before joining Caesar: Oracle Think Tank. As for Kamui, he has not realized who Joker X is. As they battle, Joker X's voice and style of play with Dark Irregulars slowly remind Kamui of a certain someone.
Aichi and Jun conduct their cardfight. Jun's "dark hero" Dimension Police units decrease the power of Aichi's vanguard. Because of this, he is forced to either take damage or use a lot of shields to guard. Even though Aichi loses Blond Ezel, he remembers his reasons for fighting and stays resolved. Using Psyqualia to gain an image of victory, Aichi superior rides Pellinore for a comeback. Afterwards, Jun leaves and has a short reunion with Kai. Now, Aichi awaits the results of Misaki's and Kamui's fights.
