قسمت 49: کای برای نجات آئی از نفوذ رِن، در یک نبرد زیرزمینی با او روبرو می‌شود.

Kai heads to the underground area to await his fateful match with Aichi. Back at home, as Aichi reviews his Shadow Paladin deck, he receives a Psyqualia-induced summon from Ren who is waiting for him at Card Shop PSY. Aichi, led by Ren's Psyqualia summon reaches as far as outside Card Capital when Kourin suddenly rides up throws him a helmet & tells him to come with her. Back at the underground area, Miwa shows up with Misaki and Kamui who both implore Kai to face Aichi in a Vanguard fight and help bring him back to normal. Just as Kai informs them that that is exactly why he is here, Kourin immediately arrives with Aichi. Miwa, Kourin, Misaki and Kamui clear the area to watch the fight from a distance. Kai upsets Aichi when he tells him that he still thinks he is weak, and Aichi vows to prove his strength to Kai as they get ready to begin their fierce battle. Aichi is startled when he realizes Kai is going to fight him with his former Royal Paladin deck. Kai vows to show Aichi the "true power" of the deck that he threw away which rattles Aichi even more. Aichi goes first and uses his units' skills to add Blaster Dark who he refers to as his avatar from his deck to his hand. Kai has a flashback of four years ago when he lost his parents, was taken in by his uncle, forced to move out of town, and transferred to a different school. There, he meets Ren and Tetsu, who challenges Kai to a cardfight. Tetsu ends up losing to Kai, and he and Ren tell Kai of Team AL4. They recruit Kai, and they have a lot of fun until one day Ren's Psyqualia awakened. He beat Tetsu repeatedly, claiming that he was now the "strongest fighter" ever. Ren abandoned the idea of him, Tetsu and Kai being Team AL4 and has begun construction for the new AL4 Headquarters where only the best fighters would be selected. Kai realizes that Ren has become obsessed with power and refuses to go along with his new plan and quickly challenges him to a cardfight. The match is fierce and as Ren announces his "Final Turn", he taunts Kai. But before he can claim victory, his overuse of Psyqualia causes him to collapse. Kai catches him in time but Ren is still fixated on how much stronger he has become. Kai quits the team and moves back home peeved about how powerless he was to stop Ren. Kai reminisces on how refreshing after all of this it was to meet Aichi again and of how much fun Aichi made him remember Vanguard fights used to be. He also remembers how fixated Aichi had become on "getting stronger". He vows to himself that while he couldn't stop Ren, this time will be different. With stern determination to accomplish this, Kai draws and uses Solitary Knight, Gancelot's skill to add Blaster Blade from his deck to his hand. Kai reminds Aichi that his avatar is not Blaster Dark as he claims but will always be Blaster Blade. Kai faces Aichi thinking that this time he is going to teach him what true strength is and declares that he is going to save him! (Source: Wikipedia)

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