As of December 5, 2021, Funimation and Crunchyroll started streaming the Entertainment District Arc of Demon Slayer. The first episode is an hour long. Since the previous season focused on the events from the Mugen Train movie, this is when new content actually starts for those who did not read the manga.
While the Mugen Train Arc focused on the Flame Hashiro, Kyojuro Rengoku, the Entertainment District Arc acquaintances Tanjiro with another member. Sound Hashira Tengen Uzui is investigating Yoshiwara after his wives go missing. The same goes for the antagonist as well. Similar to how Akaza first showed up during Mugen Train, this arc introduces Daki. Daki is yet another member of the Upper Twelve.
You can watch the teaser for Demon Slayer Entertainment District Arc here:
Demon Slayer, or Kimetsu no Yaiba, originally ran in Weekly Shonen Jump from February 2016 to May 2020. It focuses on Tanjiro, who seeks to turn his sister Nezuko back to a human after she becomes a demon in the aftermath of their family’s slaughter. In order to do so, he becomes a demon slayer. It is the eighth best-selling manga series of all time, and the anime also proved incredibly successful.
Demon Slayer is streaming on Crunchyroll and Funimation. The Entertainment District Arc started airing on December 5, 2021, with episodes every Sunday.