Both the official website account Twitter for the anime Demon Slayer: Kimetsu no Yaiba announced that the fourth episode of the Demon Slayer: Kimetsu no Yaiba Mugen Train Arc (Kimetsu no Yaiba: Mugen Ressha-Hen) anime will be delayed by one week due to coverage of the Japanese House of Representatives elections.
The fourth episode, which was therefore originally scheduled to air on October 31st, will now premiere on November 7th on Fuji TV. All other broadcasts of the series will also be delayed by one week.
Demon Slayer: Kimetsu no Yaiba Mugen Train Arc is a seven-episode arc that adapts the movie Mugen Train; the adaptation premiered on October 10th.
Source: ANN