Insult

Enmu revels in human despair and explains that the conductor's punched tickets triggered a hidden spell that put the slayers to sleep. He cannot fathom how Tanjiro pierced the dream and woke. As Tanjiro draws his sword and condemns the demon for invading people's hearts, Enmu spots his earrings and grows eager, believing he can earn more of Muzan's blood and rise in rank.

Tanjiro attacks with Water Breathing, Tenth Form, while Enmu counters with a Blood Demon Art that commands sleep through the mouth on his palm. Each time Tanjiro drifts off he wakes again, and the demon realizes the slayer is killing himself inside the dreams to break free. Enmu then conjures a nightmare of Tanjiro's dead family blaming him for surviving, but the cruelty only enrages him. Declaring that his family would never speak such words, Tanjiro beheads the demon with Constant Flux.

The duel between Tanjiro and Enmu begins, with the demon trying again and again to force sleep while Tanjiro repeatedly wakes himself by dying within the dreams. When Enmu weaponizes a vision of the slain Kamado family, Tanjiro's fury drives him to decapitate the demon.

The beheading proves hollow. Enmu's head reattaches to the roof, and he reveals that the body destroyed was never his true form. While everyone slept he fused with the entire Mugen Train, turning it into his own flesh and making its roughly two hundred passengers his hostages. Just as Tanjiro begs his sleeping companions to wake, Inosuke bursts through the ceiling and joins the fight.

This chapter sits within the Mugen Train Arc and corresponds to Episode 30 of the anime. It escalates the dream-spell premise into a full body-horror reveal, establishing that the locomotive is now a single demonic organism. The arrival of Inosuke at the end sets up the multi-slayer defense of the passengers that follows.