Akaza

The blast resolves into a tattooed demon whose eyes mark him as Upper Rank Three. He lunges at the injured Tanjiro, but Kyojuro splits his arm with Flame Breathing, Second Form, driving him back. The demon heals instantly, praises the blade, and Kyojuro deduces from the regeneration that he faces an Upper Rank. The demon names himself Akaza and proposes that Kyojuro become a demon, arguing that his humanity dooms his strength to fade with age and death.

Kyojuro answers that mortality is exactly what lends human life its value and nobility, rejecting the claim that Tanjiro is weak. Akaza takes a fighting stance with Compass Needle and declares he will kill the Hashira for refusing. The two collide in an explosion too fast for Tanjiro to follow, and the duel between Kyojuro and Akaza begins in earnest.

Akaza arrives at the crash site and tries to kill Tanjiro before Kyojuro blocks him. Their conversation lays out a clash of philosophies: Akaza venerates eternal strength, while Kyojuro honors the meaning found in a finite life. The Hashira firmly turns down the offer to become a demon.

The fight escalates as Akaza unleashes shockwave techniques from a distance, including Air Type, which Kyojuro counters with Blooming Flame Undulation. Closing the gap, the Hashira trades rapid slashes against Akaza's fists. When Akaza demands his full attention, Kyojuro answers with Flame Tiger, met by the demon's Disorder.

This Mugen Train Arc chapter, adapted in Episode 32, marks Akaza's debut and frames the central theme of the arc through the duel of values between him and Kyojuro. The wiki notes a translation error in an early official release that wrongly implied Tanjiro could track the combatants' movements, a point the anime corrects by showing he cannot.