Kousatsu Note / Glossary / People People Tamayo A demon doctor who escaped Muzan's control and makes medicine to turn demons human. A demon doctor who escaped Muzan’s control and makes medicine to turn demons human. Lore articles that mention this How does Demon Slayer end? The Demon Slayer Corps holds Muzan in place until dawn and destroys him in the sunlight. Text Who is the Master, Kagaya Ubuyashiki? Kagaya Ubuyashiki, known as the Master, is the head of the Ubuyashiki family, which has led the Demon Slayer Corps for generations. Text