The opening of the episode is Tanjiro being a bit ridiculous as he freaks out over the 300 year old sword he found ... the doorway where Tanjiro and Muichiro the Mist Hashira are.

All nine Hashira, the highest-ranking Demon-Slayer swordmen: Giyu Tomioka (Water Hashira), Kyojuro Rengoku (Flame Hashira), Tengen Uzui (Sound Hashira), Muichiro Tokito (Mist Hashira), Shinobu ...