Demon Slayers vs Muzan Kibutsuji: Part 1 (2025)

Demon Slayers vs Muzan Kibutsuji Part 1 is a confrontation that takes place in both the mansion of the Ubuyashiki family and the Infinity Castle. It is the first major confrontation between the Demon Slayer Corps against the Demon King Muzan Kibutsuji.

Prologue[]

Muzan arrives at the Ubuyashiki mansion and confronts Kagaya and Amane Ubuyashiki. Muzan expresses his disappointment in the Oyakata since he himself has lived for a millennium without aging, whereas the Ubuyashiki family is reduced to their leader looking and smelling like a corpse. Kagaya doesn't deny this while stating he has lived longer than expected. To him, it does not matter as long as he has his goal of dedicating his life to defeating Muzan. He mentions that unbeknownst to him, they were once part of the same family.

Muzan doesn't understand the significance; Kagaya explains the reason for his family's curse is that one of their members - Muzan himself - became a demon. Since then, children born to the Ubuyashikis died during birth until they were informed that they could atone and survive by dedicating themselves to ending Muzan. Muzan wonders if Kagaya's rambling is due to his illness and claims he is not punished by the heavens, having killed thousands of people without suffering any divine intervention; in his long existence, he has never seen the gods or Buddha. Kagaya suddenly asks what Muzan dreams about. Unsettled by the strange question, the demon observes that around him, only Kagaya and his family are present.

The Oyakata responds by saying he dreams to be immortal and Muzan confirms this, claiming he will do so when he takes Nezuko Kamado. Kagaya tells him his belief that only human thoughts are truly immortal, then continues that the murders he committed over his life only serve to fuel the anger of those who hate him; the Demon Slayers. Kagaya tells Muzan his kind will end tonight, shocking him. Muzan angrily tells Kagaya to silence himself, but he states one more thing anyway. He believes he is undeservingly loved by his Hashira, declaring that his death would only drive them further into killing him. Muzan asks if he is finished and stretching out his hand to kill him, to which Kagaya thanks him for listening.

At the same time, a Kasugai Crow calls for all the Hashira be summoned at the Ubuyashiki Mansion in an emergency meeting, forcing everyone to run to the mountain. Suddenly, the mansion and subsequent mountainside are destroyed in a massive explosion, wiping out Kagaya, Amane, their two daughters Nichika and Hinaki, and destroying Muzan's body. The Hashiras are horrified at the blast and race to the remains of the mansion. Muzan curses Kagaya for sacrificing himself as a decoy, as he never thought he was willing to kill himself and his family just to kill him.

As he condemns him for hiding his blood lust all along, he realizes the Demon Slayers must now be aware of his presence.

Battle[]

As Muzan attempts to heal the damage, flesh seeds appear around him, bursting into giant branches that immobilize him in place. Believing he can simply absorb them in, he is suddenly attack by a hiddenTamayo, who pierces her hand through his stomach and injects a substance into him. She tells him he has now been injected with a drug developed by herself and Shinobu Kocho that can turn demons back into humans, but Muzan does not believe such a thing is possible.

The Demon King is furious at Tamayo's intervention and reminds her that it was she, not him, who killed her family. Tamayo tearfully cries out that she wanted to live and see her children survive, but Muzan presses her with the knowledge that she had killed other people as well in her desperation, claiming that she enjoyed it. To this, she does not deny that she killed innocents, and that they together will atone for those human deaths, before calling out for someone's assistance.

Suddenly, Gyomei Himejima appears, emerging from nowhere by way of Yushiro's concealment talismans, and decapitates Muzan with his flail. True to Kagaya's prediction, Muzan regenerated his head with little to no difficulty. Gyomei discerns from the sound of his flesh regenerating that Muzan is unlike any other demon he has ever faced. Recalling his master's words that sunlight is now the only option left, he resolves to keep him restrained till dawn arrives. Muzan uses his Blood Demon Art: Black Blood, Brambles at the Stone Hashira, launching thorny tendrils to slash the Hashira. Gyomei deflects the attack with the Stone Breathing, Third Form: Stone Skin. Sanemi sees the Demon King and screams, asking what he did to Kagaya, while the others arrive, worried for Kagaya.

Gyomei announces to the Hashira that Muzan is the demon who infiltrated their headquarters, and that he will not die no matter how many times he's beheaded. This greatly shocks all the Hashira beyond measure due to them never seeing Muzan in the flesh. Tanjiro Kamado however, the only one to have encountered him, reacts with fury seeing his face again.

All the remaining Hashira use their respective Breathing Styles in order to cut Muzan down: Muichiro Tokito with Mist Breathing, Fourth Form: Shifting Flow Slash, Shinobu with Insect Breathing, Butterfly Dance: Caprice, Obanai Iguro with Serpent Breathing, First Form: Winding Serpent Slash, Mitsuri Kanroji with Love Breathing, Fifth Form: Swaying Love, Wildclaw, Giyu Tomioka with Water Breathing, Third Form: Flowing Dance, and Sanemi Shinazugawa with Wind Breathing, Seventh Form: Gale, Sudden Gusts. Tanjiro joins in the fight and uses the Hinokami Kagura: Sunflower Thrust. All the Demon Slayers converge on the immobilized Muzan, but instead of being concerned, Muzan gives off a disturbing smile.

Doors open beneath all of the Demon Slayers, causing them to plummet into the Infinity Castle. Muzan mocks the Demon Slayers for believing they had him cornered, declaring they are in Hell now and that he will slaughter them all tonight. Tanjiro refutes and says that it is Muzan who will go to Hell, to which he scoffs and dares Tanjiro to try if he can, who yells back that he absolutely will.

Aftermath[]

Shinobu, cut off from everyone else, walks through the castle and suddenly smells blood. She walks into a large water-filled room with lilies and wooden planks and enters. Inside she sees someone with multiple female corpses all around him; the demon hears the door creak and turns around to meet his new visitor.

Tanjiro and Giyu fall side by side, Tanjiro nearly falling to his death only to be saved by Giyu catching him. Tanjiro thanks the Hashira but senses a demon creeping up behind him, quickly killing it with Water Breathing, First Form: Water Surface Slash. Many more demons follow and attack them, requiring both to use Water Breathing, Sixth Form: Whirlpool and Water Breathing, Third Form: Flowing Dance. Tanjiro venerates Giyu for his skills on using Breathing Styles and can tell which move he does just from the slightest movement he did so he may also use another move without cutting each other.

Obanai and Mitsuri fall together, with Obanai using Serpent Breathing, Fifth Form: Slithering Serpent to kill a plethora of demons. While he threatens the demons to stay away from Mitsuri, she gushes over how strong and great Obanai is with him asking her if she is okay.

Cut off from everyone else, Sanemi singlehandedly kills hordes of demons, angered at his inability to protect Kagaya and swearing to slaughter them all. Gyomei and Muichiro are together killing demons, to which Gyomei stated that each of the demons have the same power of a Lower Rank of the Twelve Kizuki, believing Muzan is sending them en masse to wear them down. Muichiro is angered at the death of the closest thing he had to a living father figure, Kagaya, and his fury is shared by Gyomei.

With Nakime's eyeball spies presumably having located the entirety of the active Corps' current location Inosuke Hashibira, Genya Shinazugawa, Murata, Zenitsu Agatsuma, and Kanao Tsuyuri are all taken by surprise when the Infinity Castle's doors underneath them suddenly open up, causing them to fall inside. Most are shocked, confused, and frightened by the sudden turn of events. The exceptions were Inosuke who was thrilled at the new challenging adventure, and Zenitsu who remained calm and only burned with determination to confront his former superior Kaigaku who had defected to the demons.^[1]

Elsewhere, trapped in Muzan's flesh cocoon, Tamayo calls out for help as she is slowly being absorbed by the demon.

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