Rehabilitation Training Arc

The Rehabilitation Training Arc is the sixth main storyline of the Kimetsu no Yaiba manga, covering Chapter 45 through Chapter 53 and adapted in Episodes 22 through 26 of the first anime season. Its events unfold at the Ubuyashiki estate and the Butterfly Mansion, placing it between the Mount Natagumo Arc and the Mugen Train Arc.

This arc is a turning point built less on combat than on consequence and preparation. It formally confronts the contradiction at the heart of Tanjiro's journey: a member of a demon-slaying organization who refuses to kill the demon he loves.

Every member of the Demon Slayer Corps is bound by oath to destroy demons on sight, which makes Nezuko's existence a serious problem for the organization. The arc opens with the question of how the Hashira, the elite captains who lead the Corps, will respond to Tanjiro keeping and defending his transformed sister.

This brings a gathering of the Hashira, where Tanjiro and Nezuko are judged and the leader of the Corps, Kagaya Ubuyashiki, weighs in on their fate. The sequence introduces the full lineup of pillar-rank swordsmen and establishes the political and emotional stakes that surround the siblings going forward.

Following the verdict, Tanjiro recovers from his injuries and undergoes intensive conditioning at the Butterfly Mansion, training alongside other slayers to rebuild and sharpen his abilities. Running parallel to this, Muzan Kibutsuji marshals his own demonic underlings and steps up the effort to locate Tanjiro.

By the end of the arc, Tanjiro has been physically restored and meaningfully strengthened, and Nezuko's place within the Corps has been settled enough for the pair to continue their mission. The arc's wide cast of newly introduced Hashira and support characters seeds relationships and conflicts that pay off across the rest of the series.

With Muzan actively closing in and his servants in motion, the stage is set for the high-stakes confrontation aboard the Mugen Train in the arc that follows.