Enmu was the primary antagonist in the Mugen Train Arc of Demon Slayer: Kimetsu no Yaiba. He was a demon affiliated with the Twelve Kizuki, holding the position of Lower Rank One. His power is putting people into a deep sleep where the only way to wake up is if the user dies in the dream. To use this power, he must use the mouths on his hands to say "go to sleep". Then, the target will lose consciousness. The one con of this power is that Enmu must see the target's eyes to use said power.