In Yu-Gi-Oh, but Mechanical Ascension (1-148).

Summary

You Feng showcases his powerful "Armored Prison Dragon - Electronic Dark Underworld Dragon," boasting an attack power of 6400, which shocks Katsuya Jonouchi and others. Katsuya's fusion material, the "Zhen Hong Yan Hei Long," is taken from his graveyard, leading to disbelief and frustration. As the duel progresses, You Feng uses Katsuya's card to enhance his dragon's attack, ultimately defeating Guangming's "Dark Black Dragon" and knocking him out of the duel. Despite Katsuya's loss, he vows to defeat You Feng in the finals. The chapter concludes with Kaiba Seto announcing the upcoming quarter-finals and the characters preparing for the next stage of the tournament, while You Feng receives the "Red-Eyes Black Dragon" from Kong Que Wu to integrate into his deck.

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