Kimetsu no Yaiba S03E01 - Someone's Dream

After their battle with the Upper Rank Six siblings, Tanjiro, Zenitsu, Inosuke, and Nezuko are found by the Kakushi. In the Infinity Castle, Muzan Kibutsujisummons the remaining five Upper Rank demons – Akaza, Upper Five Gyokko, Upper Four Hantengu, Upper Two Doma and Upper One Kokushibo. He admonishes them for their failure to kill the Ubuyashikis and find the Blue Spider Lily. When Gyokko provides new information, he is sent on a joint mission with Hantengu. While Zenitsu and Inosuke are summoned to individual missions, Tanjiro continues his rehabilitation. When his swordsmith Hotaru Haganezuka refuses to forge him a new sword, Tanjiro is told to meet him at the Swordsmith Village to discuss the matter in person. He arrives with Nezuko and meets the village's chief, Tecchin Tecchikawahara, who reassures Tanjiro he will bring Hotaru back to build the sword. Tanjiro is later shown to the village's hot springs where he meets the Love Hashira Mitsuri Kanroji, who is initially dejected after being ignored by an unknown person. While in the hot springs, Tanjiro encounters Genya, the Wind Hashira Sanemi Shinazugawa's younger brother and fellow Demon Slayer, who refuses Tanjiro's hospitality and storms off. At the village, Mitsuri hints at Tanjiro about a "secret weapon" hidden somewhere that can make him stronger and bids farewell to the siblings. The next day, while searching for the weapon, Tanjiro finds the Mist Hashira Muichiro Tokito in an argument with someone and sees that seemingly with them is a man from his dreams.