Hashira Training Arc

This is the tenth story arc of the series, covering chapters 128 through 139 of the manga and adapted across episodes 56 through 63 of the anime. The action moves between the Butterfly Mansion, the Ubuyashiki Mansion, and ultimately the Infinity Castle.

The arc functions as a turning point that prepares both the characters and the audience for the climactic conflict, focusing on growth and preparation rather than a single villain battle.

Once it becomes known that Nezuko can endure sunlight, the demons go silent, since Muzan now covets her body as the key to overcoming his own greatest weakness. The Corps understands this lull signals that a devastating clash is near, prompting Kagaya Ubuyashiki to institute a demanding training regimen for all ranks.

Even the Hashira take part, each running members through punishing exercises tailored to their own Breathing styles. Tanjiro treats the program as a chance to recover, strengthen himself, and learn from the most powerful slayers in the organization, cycling through their stations to absorb everything he can. The arc concludes as the calm finally breaks and the enemy makes its move.

The relentless training leaves the entire Corps sharper and more unified, raising the baseline strength of its fighters in anticipation of the war to come. Tanjiro in particular emerges considerably more capable.

The period of preparation ends abruptly when Muzan strikes, propelling the story directly into the Final Battle Arc and the descent into the Infinity Castle for the decisive confrontation.