Repetitive Action

Gyomei instructs the trainees that the legs and hips anchor every movement, granting precise attacks and solid defense. His three trials require standing under a waterfall, hauling three large logs, and pushing a massive boulder the distance of one cho. When Zenitsu faints at the prospect, Gyomei has Tanjiro toss him into the frigid river. The cold proves brutal, and trainees cluster around a sun-warmed rock for relief.

Tanjiro and Inosuke progress quickly, with Tanjiro soon enduring the falls long enough to advance to log carrying. At a meal, Inosuke calls Gyomei the strongest of the Corps, and Tanjiro senses the Stone Hashira may be close to manifesting the Mark. Zenitsu doubts Gyomei could move such a boulder, only to watch him push an even larger one with ease.

Despite clearing the first two trials, Tanjiro cannot budge the boulder even after six days, and several trainees abandon the mountain. Genya then appears, having broken the rule against contacting Sanemi, and thanks Tanjiro for protecting him. Noticing Genya has shifted the boulder, Tanjiro learns of Repetitive Action, a focusing technique Genya performs by chanting. Elsewhere, the Biwa Demon Nakime reports to Muzan that she has located sixty percent of the Corps but not yet Nezuko.

Gyomei lays out the three trials of his strength-training stage.

Tanjiro clears the waterfall and log stages but becomes stuck on the boulder.

Genya introduces Tanjiro to Repetitive Action, and Nakime continues mapping the Demon Slayers for Muzan.

The chapter sets up Tanjiro's breakthrough by introducing the focusing method that bridges into manifesting the Mark. It also reintroduces Nakime as Muzan's search tool, keeping the looming final conflict in motion alongside the training subplot.