Kyojuro Rengoku heads to the Mugen Train to investigate the disappearance of over forty passengers and encounters a demon along the way. After saving the people attacked by the demon, he finally arrives at the Mugen Train. What lies ahead of him?

With Tanjiro successfully awakening from his dream, he confronts the demon responsible, Lower One Enmu. But the situation challenges Tanjiro's resolve when Enmu proves more powerful that any demon he's ever faced.