: The episode ends on a high-stakes cliffhanger as Tanjiro awakens at the Demon Slayer headquarters, facing the assembly of the elite Hashira for the first time. Demon Slayer: Kimetsu no Yaiba Season 1 Episode 21 Recap
In episode 21 of Kimetsu no Yaiba (Demon Slayer), titled the Mount Natagumo arc concludes as we explore the tragic origins of the Lower Five demon, Rui, and witness a major internal conflict within the Demon Slayer Corps. The Tragedy of Rui
The episode begins with a deep dive into Rui's human past. Once a sickly boy unable to walk, he was visited by Muzan Kibutsuji, who offered him a "strong body" by turning him into a demon.