Muzan Kibutsuji

Episode 7 covers Chapters 12 and 13 and closes out the swamp encounter before moving the story to Taisho-era Tokyo. The first half shows Tanjiro and Nezuko finishing the three clones of the Swamp Demon, with Tanjiro diving into the demon's watery domain to behead two of them at once. The second half relocates to Asakusa, where the dazzling modern city overwhelms the country-raised Tanjiro right before he stumbles onto Muzan living openly among humans.

Ending the swamp hunt

Nezuko keeps one clone busy while Tanjiro leaps into the swampy portal, where he uses Water Breathing techniques to cut down two clones underwater. Surfacing, he severs the arms of the last copy and presses it for information about Muzan, but the demon is too terrified of its master to talk and is destroyed when it tries to attack.

A hard truth for Kazumi

Tanjiro returns Satoko's hairpin to Kazumi and urges him to keep living no matter how much he has lost. Kazumi, seeing the calluses earned through brutal training, apologizes for lashing out, and Tanjiro leaves him to care for the rescued girl as dawn arrives.

Asakusa and Muzan

His crow sends him straight to Asakusa, where Tanjiro is stunned by the trams and tall buildings. While eating udon he catches a demon's scent, follows it through the crowd, and grabs a man with red, cat-like eyes: Muzan, posing as a husband and father. Muzan calmly denies knowing him, then slashes a passerby, turning him into a demon that bites his own wife as the crowd panics.

The eyecatchers loosely recreate the covers of Chapters 12 and 13. A small change from the manga: in the anime Tanjiro drops a bowl of udon when he senses Muzan, whereas the printed version has him set down a cup before rushing off. This episode marks the first on-screen appearance of Muzan, the demon progenitor, in human disguise.