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The Demon Boss is the leader of all Demons and Humans in the Demon World. The name () is not yet clear but mentioned in several instances:
- Sister Krone had a private talk with Norman and Emma then she mentions the Demon's name.
- The Demons have a tea party that offers something to the Demon boss.
- If the kids break the Promise, Mujika says they'll make an enemy of the Demon Boss. But Sonju said that the Demon Boss was their enemy from the very start .
- ↑ Yakusoku no Neverland Manga: Chapter 48, Page 17