Tập 8: Kai thách đấu Kamui trong một trận đấu bài để đối đầu với Quatre Knights một mình.

8

Kai, Misaki, Naoki, and Miwa meet with Kamui at Card Capital and inform him about the Quatre Knights. To keep his mates from getting involved any further, Kai decides to go fight the Quatre Knights by himself. However, Kamui stops Kai by challenging him to a cardfight. During the battle, Kamui expresses how he and the others want to find Aichi as much as Kai does. After using his newfound Legion skill, Kamui defeats Kai. As Kamui explains, Kai is the vanguard of the group while he, Misaki, Naoki, and Miwa are the rear-guards who will support him no matter what. Kai realizes and acknowledges this, and so the group sets out to become stronger. Meanwhile, the Quatre Knights are making their next move... (Source: Wikipedia)