الحلقة 21: يواجه آيتشي وكاموي بعضهما البعض بينما يتحدى كينجي غاوكي في معركة بطاقات محورية.

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Q4 returns to Japan with new strategies for winning being devised. Aichi and Kamui test them in the final round of a tournament held at Card Shop Handsome. Unbeknownst to them, Kenji "Koutei" Mitsusada arrives, looking for Aichi. Gouki tells him that Aichi is currently in a cardfight with Kamui. Feeling anxious and being short on time, Kenji decides to leave until Gouki challenges him. It is the first-ever match between the two. Although Gouki gets a bad starting hand with no grade 2 or 3 units, he manages to make it to the next grade by superior riding with cards he sent to the drop zone, including his new ace card, Ice Prison Necromancer, Cocytus. Kenji is impressed by Gouki's resolve to overcome the odds stacked against him, to which Gouki expresses his disappointment in Kenji the "Emperor" for saying such a thing to begin with. Remembering the feeling of never giving up, Kenji continues to play at his best, Crossriding Ultimate Dimensional Robo, Great Daiyusha and winning the match. After the battle, Kenji reveals his reason for coming: to tell Aichi that he is leaving to attend the SIT university and won't have the chance to participate in tournaments again until he graduates. Kenji was at first wavering on whether he could survive on his own and wanted Aichi to give him words of encouragement. But he regained his confidence after fighting Gouki, who gives Kenji his bandana as a farewell gift. Then, all of his friends go with Kenji, wearing Gouki's bandana, to the airport and wish him well in his upcoming journeys. (Source: Wikipedia)