Stone Hashira, Gyomei Himejima

Episode 62, the seventh of the fourth season, adapts the rest of Chapter 135 and all of Chapter 136. Its emotional core is Gyomei Himejima's backstory, told to an exhausted Tanjiro after he finishes the Stone Hashira's grueling boulder course. The episode also advances the larger plot with Genya, a spar between Giyu and Sanemi, Zenitsu's quiet resolve, and the ominous appearance of both Nakime's eye and Muzan himself.

Gyomei's past

After Tanjiro pushes the boulder a full cho and nearly passes out from dehydration, Gyomei revives him with water and acknowledges him. He then recounts raising orphans at a temple, including the small girl Sayo, until a child broke the rules and led a demon inside. Fighting bare-handed, Gyomei pounded the demon until dawn to save Sayo, only to be branded a monster and nearly executed before Kagaya intervened.

Sparring and resolve

Tanjiro stumbles onto Giyu and Sanemi sparring with wooden swords, watching their Wind and Water Breathing forms clash until both blades shatter. His attempt to bond with Sanemi over ohagi earns him a punch. He also notices Zenitsu has turned grim and silent, clutching a letter and insisting on handling whatever lies ahead alone.

Muzan arrives

By himself, Sanemi grabs a twitching object behind him and finds it is Nakime's eye, realizing the Corps has been infiltrated. At the Ubuyashiki mansion, Amane stands beside Kagaya as Muzan walks calmly to their door, meeting the Demon Slayer Corps leader for the first time.

The second eyecatcher recreates the cover of Chapter 136. The anime adds an opening scene of the crow Ukogi delivering Zenitsu's letter and expands Gyomei's backstory with an original temple dinner and a vivid depiction of the traitor extinguishing the wisteria incense, even naming three previously unnamed orphans. The anime also shows Giyu and Sanemi already fighting when Tanjiro arrives, and changes how Sanemi crushes Nakime's eye before it disintegrates.