The Hashira, Sanemi and Iguro, along with their comrades head to an abandoned castle on top of a mountain for a mission, while Tanjiro is being treated at the Butterfly Mansion for the wounds he suffered at the Swordsmith Village. Later on, the Hashira gather at the Ubuyashiki Mansion to hold a Hashira meeting, where Muichiro reveals how the marks manifested. In an effort to strengthen the entire Demon Slayer Corps from the bottom up, the Hashira Training begins...
See, there are times when your connections
to others can get you out of a jam...
Ya ves que conectar con otros
puede acabar salvándote la vida.
Viu, tem horas quando suas conexões 
podem salvar você de uma pior...
Порою связь между людьми способна
выручать из самых страшных передряг.