Daisuke Hirakawa (平川大輔), the Japanese voice of the demon Enmu, said that playing Enmu in a way that made light of his castmates' performances was painful and left him feeling apologetic. The official Demon Slayer account shared his comment as the TV rerun aired Mugen Train Arc episode 5 on November 8, 2026, according to an Anime Anime report on the episode.
The official account shares a comment from a cast member each week to mark the full TV series rerun. Hirakawa's comment focuses on Tanjiro, who trusts Rengoku and his allies in the rear cars and runs forward with Inosuke. He said Tanjiro's resolve to protect everyone and let no one die moved him. "Taking in the lines and passion the cast delivered with such intense focus, then playing Enmu in a way that made light of them, felt very painful to me personally, and I felt sorry," he said (translated).
The episode's Japanese title is "Mae e" (前へ, glossed as "Forward"). Light spoilers follow. Kyojuro Rengoku takes charge of the rear five of the train's eight cars and assigns the other three to Zenitsu and Nezuko. He sends Tanjiro and Inosuke to find the demon's neck, and the two locate its "neck bone" in a front car.
The rerun airs Sundays from 9:30 to 10:00 a.m. Japan time (JST) on Fuji TV and other stations, according to the report. Animation studio ufotable said episode 6, "Akaza" (猗窩座), airs next week.