Kousatsu Note ／ Glossary ／ People People Kagaya Ubuyashiki Head of the Ubuyashiki family, which leads the Demon Slayer Corps. Head of the Ubuyashiki family, which leads the Demon Slayer Corps. Read the lore article → Lore articles that mention this Who is Muzan, and why did he become a demon? Muzan Kibutsuji was a young aristocrat in the Heian period, over a thousand years ago, who was dying of illness. Text
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