Tập 6: Câu lạc bộ Cardfight của Học viện Miyaji đối đầu với Trường Trung học Hitsue trong một trận đấu nội bộ năm trận thắng hai với mức cược cao.

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Miyaji Academy's unofficial Cardfight Club is set up to have an intramural match against Hitsue High School's Vanguard Club, in which Kai, Miwa, Morikawa, and Izaki are members. The two teams play in a best-of-5 match, and opponents are randomly selected. Under the conditions that Naito established, if the Cardfight Club loses this match, then it will be dissolved. In the first game, Naoki fights Kai, with both using Eradicator-themed Narukami decks. Naoki combines both the Break Ride of Eradicator, Vowing Sword Dragon and the Limit Break of Eradicator, Gauntlet Buster Dragon to retire Kai's units and gain more critical value and power, but Kai manages to survive the assault. Then, Kai uses a similar devastating combo with Vowing Sword and Eradicator, Dragonic Descendant. Although Naoki blocks his first attempt, Kai activates Descendant's Limit Break to have it stand up, gain another critical, and attack again. Unable to defend this attack, Naoki loses, thus putting Hitsue High up 1-0. For the next fight, Kourin is chosen to battle Izaki (which leaves Morikawa extremely envious). (Source: Wikipedia)