Pay annually (save 13%) recommended. Webthe illness on kagaya ubuyashiki, the leader of the hashiras and head of the demon slayer corps, is due to a family curse linked to muzan kibutsuji being born in their. Webthe ubuyashiki family is the leader of the demon slayer corps and has a longstanding feud with muzan, the progenitor of all demons. They are related to muzan. Webhowever, before muzan can take out the leader of the group hellbent on destroying him, the mansion explodes, incapacitating the demon and killing ubuyashiki,. Webdemon slayer's hashira training arc finale sets the stage for the final battle with muzan, marking the start of the biggest showdown. Webkagaya ubuyashiki is the head of the demon slayer corps and a distant relative of muzan kibutsuji, the original demon. He suffers from a deadly curse that. Hashira training arc episode 1 ending: Lord ubuyashiki seeks tamayo’s help. At the butterly mansion, zenitsu returns from his mission to find aoi, naho, kiyo,. Webin other words, oyakata is a japanese honorific title bestowed upon a person of high respect and power, such as kagaya ubuyashiki, who is in charge of.