Demon Slayer season 3 has been officially announced, right after the finale of Demon Slayer: Kimetsu no Yaiba – Entertainment District Arc (episode 11) which finished airing in Japan. Season 3 will cover the Swordsmith Village Arc of the manga, and you can see the teaser visuals:
The Swordsmith Village Arc begins in volume 10 of the manga. VIZ describes the story:
For the first time in over 100 years, the upper ranks of Muzan Kibutsuji’s Twelve Kizuki are not full. Angered, Muzan dispatches the survivors on another mission. Elsewhere, Tanjiro journeys to a village of swordsmiths and has to explain how his sword was so badly damaged to Haganezuka, the smith who made it. While Tanjiro waits for his sword to be repaired, enemies close in…
Season 1 of Demon Slayer covered the first 6 arcs, while the Mugen Train movie (and later the TV anime version) covered the 7th. The Entertainment District Arc was the 8th, and the Swordsmith Village Arc comes right after it as season 3 for Demon Slayer.
Source: Official Twitter
©Koyoharu Gotoge / SHUEISHA / Aniplex / ufotable