During the Mugen Train Arc , he successfully protected all 200 passengers from the demon Enmu.
His duel against the Upper Rank Three demon, Akaza , highlighted his extraordinary strength. Despite suffering fatal wounds, Rengoku refused to become a demon, choosing instead to die as a human. He held Akaza until sunrise, forcing the demon to flee in fear. Impact and Legacy 1 : Flame Hashira Kyojuro Rengoku
His signature phrase, "Set your heart ablaze," serves as a core theme for the series, encouraging others to live with passion and move forward despite any despair. During the Mugen Train Arc , he successfully
His ultimate technique, Ninth Form: Purgatory , remains one of the most powerful and visually stunning displays of Flame Breathing in the franchise. If you'd like to dive deeper, I can: Detail the specific forms of Flame Breathing he used. He held Akaza until sunrise, forcing the demon