
Chapter 121 of Kimetsu no Yaiba closes Muichiro's fight in the swordsmith village. Drawing on the rage that drove him to slay demons, the Mist Hashira veils the field in mist, toys with Gyokko's perception of speed, and ends the Upper Rank for good.
Muichiro stokes himself by recalling the seething hatred he felt when he and his brother were left to be devoured by maggots, reminding himself that he became a slayer for a single purpose: to wipe out every demon. Gyokko, congratulating himself on his earnest resolve, unleashes his Blood Demon Art, Killer Fish Scales, certain the scales make his motions impossible to read and that the slayer is finished.
Muichiro answers with Mist Breathing, Seventh Form: Obscuring Clouds, disorienting his foe and seeming to flicker in and out of view. Gyokko searches frantically as the whole area fills with mist. The slayer reappears, remarking that he had not even been trying before, and severs the demon's head. Gyokko cannot grasp why his vision has flipped as his head tumbles to the earth, then rages at being beheaded by a child. It is shown that Muichiro deliberately altered his pace, capable of moving extremely slowly or with blinding quickness, his top speed surpassing the demon's own.
Gyokko launches into a monologue about being one of the chosen and about humanity's inferiority. As he moves to dismiss Muichiro as a maggot, his head is cut into pieces. The chapter ends with the Mist Hashira telling him that it is over and to depart for hell.
Published in August 2018, this chapter is part of the Swordsmith Village Arc and appears in Volume 14. Episode 53 of the anime covers its events. Featured characters include Muichiro Tokito, Gyokko, and Kozo Kanamori, with Yuichiro Tokito and Amane Ubuyashiki recalled in memory.

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Chapter 121 of Kimetsu no Yaiba, titled Abnormal Situation, closes Muichiro Tokito's fight against Gyokko in the swordsmith village. The Mist Hashira veils the field in mist, varies his pace to surpass the demon's speed, and severs Gyokko's head to end the Upper Rank for good.
Yes, Chapter 121 of Demon Slayer ends the duel between Muichiro Tokito and Gyokko of the Twelve Kizuki. Muichiro defeats Gyokko by cutting his head into pieces and tells him that it is over and to depart for hell.
In Chapter 121, Muichiro Tokito answers Gyokko's Killer Fish Scales with Mist Breathing, Seventh Form: Obscuring Clouds. The technique disorients Gyokko and fills the area with mist, making Muichiro seem to flicker in and out of view.
Demon Slayer Chapter 121, Abnormal Situation, is part of the Swordsmith Village Arc and appears in Volume 14. It was published in August 2018.
Episode 53 of the Demon Slayer anime covers the events of Chapter 121. Featured characters include Muichiro Tokito, Gyokko, and Kozo Kanamori, with Yuichiro Tokito and Amane Ubuyashiki recalled in memory.
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