Webthe demon slayer season 4 finale sees kagaya sacrificing his family to kill muzan. The cursed ubuyashiki family has kiriya, with black hair, succeeding as the 98th leader. Webthe main reason muzan was now able to locate the ubuyashiki household, even though he had always actively been trying to find and kill the clan, was due to. Webas the overseers of the organization dedicated to ridding the world of demons and their evil influence, they shoulder the immense burden of defeating muzan kibutsuji, the originator. Webubuyashiki, alongside his wife, and two of his daughters, were dead by the end of the episode. However, this was a move that was initiated by ubuyashiki himself. Webnichika's character highlights the diversity within the ubuyashiki family and underscores the notion that it's not necessary to have extraordinary powers to contribute. Webthe curse that haunts the ubuyashiki family is a hereditary condition impacting the male members across generations. The condition stems from muzan. Webas per ubuyashiki, if he dies, the hashiras will be fuelled up and get more motivated towards the eradication of the demons. Listening to this, muzan gets angered. 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. The ubuyashiki clan's origins link them with muzan, whose crimes against nature have culminated in a curse upon the clan.