The Mu in Muichiro

After their battle in the Entertainment District, Tanjiro, Zenitsu, Inosuke, and Nezuko are found by the Kakushi. In the Infinity Castle, Muzan summons the remaining Upper Ranks. He admonishes them for their failure to kill the Ubuyashiki family or find the Blue Spider Lily. When Upper Five Gyokko provides new information, he is sent on a joint mission with Upper Four Hantengu. While Zenitsu and Inosuke are sent to individual missions, Tanjiro continues rehabilitating. When swordsmith Hotaru Haganezuka refuses to forge him a new sword, due to Tanjiro always damaging his blades, Tanjiro journeys with Nezuko to the Swordsmith Village to discuss the matter. He meets village chief Tecchin Tecchikawahara, who reassures him about Hotaru. Tanjiro is shown to the village's hot springs where he meets Love Hashira Mitsuri Kanroji and Genya, Sanemi Shinazugawa's younger brother and fellow Final Selection survivor. Mitsuri later hints at Tanjiro about a "secret weapon" that can make him stronger. The next day, Tanjiro finds Mist Hashira Muichiro Tokito arguing with someone and seemingly with them is a man from his dreams.