While chasing down a clue about Aichi`s disappearance at Psy, Kai meets Olivier Gaillard of the mysterious group Quatre Knights. Gaillard wants Kai to forget all about Aichi... and, as they fight, he claims that he represents Aichi`s will!

Kai decides to continue the quest for Aichi and face the Quatre Knights on his own so his friends won`t get hurt or worse, but Kamui stands in his way. Kamui and the others are willing to brave danger for Aichi`s sake, whatever Kai says. Kamui throws down the gauntlet to begin an epic card fight over their future course of action.