The Demon Slayer: Kimetsu no Yaiba Mugen Train Arc TV series will include an all-new episode 1 featuring the day leading up to the events in the movie, plus re-edited 6 episodes featuring new scenes and music, for a total of 7 episodes.

— Demon Slayer: Kimetsu no Yaiba (English) (@DemonSlayerUSA) September 25, 2021