Webbecause their bloodline produced the first demon, the ubuyashiki family was cursed, and every male child born in the family would be born with a disease that would kill them. Webkagaya ubuyashiki’s death in the manga in chapter 138 of the kimetsu no yaiba manga, kagaya ubuyashiki’s demise unfolds in a dramatic and strategic manner. Webbut before muzan can kill the group’s leader, who is determined to destroy him, the mansion blows up, killing ubuyashiki, his wife, and their two children and rendering. Webhowever, the ubuyashiki family’s legacy is one of profound suffering, driven by an ancient curse that has haunted them for generations. The ubuyashiki family is. Webkuina ubuyashiki (産 (うぶ) 屋 (や) 敷 (しき) くいな, ubuyashiki kuina?) is the fourth child and third daughter and one of the youngest daughters of kagaya ubuyashiki. Webkanata ubuyashiki (産 (うぶ) 屋 (や) 敷 (しき) かなた, ubuyashiki kanata?) is the youngest daughter of kagaya ubuyashiki. She currently serves her older brother, the. Webthe 8th and final episode of demon slayer season 4: The hashirs training arc started with the king of demons muzan kibutsuji making his way down to the. Webwhy did ubuyashiki's (head of the demon slayer) two daughters off themselves aswell when muzan came to the mansion? I can understand why the head of the mansion did it.