Awful Villain

The 51st anime episode and seventh of the third season covers chapters 115 through 118 and takes its name from chapter 116. Just as Tanjiro nearly beheads the shrunken Hantengu, a new presence interrupts him. The demon Sekido has absorbed his fellow manifestations to become Zohakuten, the embodiment of hatred, who wraps the cowering Hantengu in a wooden burl and summons enormous tree dragons. The episode intercuts this confrontation with Muichiro's struggle against Gyokko's water prison, where the young smith Kotetsu refuses to let the Hashira drown.

The birth of Zohakuten

After Tanjiro cuts the tiny Hantengu and Genya severs Aizetsu's arm, Sekido absorbs Karaku, Urogi, and Aizetsu, kneeling and transforming into Zohakuten. The new demon beats a drum to conjure five wooden dragons that drag Tanjiro skyward until Nezuko catches him.

A clash of words

Zohakuten calls the Demon Slayers cruel for tormenting the weak. Tanjiro counters that the demons reek of countless victims and insists that helping others requires no justification, a remark that strikes a nerve and provokes another dragon assault.

Muichiro's rescue

Trapped and out of air, Muichiro resigns himself to death, but Kotetsu stabs at the pot and finally blows bubbles into it so the Hashira can breathe. A red-eyed figure speaks of human strength through mutual aid, and Muichiro breaks free with Eight-Layered Mist, realizing those eyes match his father's.

The episode is named after chapter 116 and its second eyecatcher recreates chapter 117's cover. The anime makes Sekido's transformation clearer, showing him on all fours shedding his old clothing. Zohakuten's dragon summon is also restaged, with a shockwave preceding their emergence from dust rather than contorted trees rising from the ground. The manga's narration explaining that Hantengu's power grows the more frightened he becomes is omitted from the adaptation.