Chapter Summaries

Kagaya Ubuyashiki confronted Muzan, taunting him about his fear of Su Chen and revealing that he believed Su Chen would kill him. As Muzan grew angry and demanded to know where Su Chen was, a switch clicked inside the room.

• Muzan mocked Kagaya Ubuyashiki’s failing health, but Kagaya said he had survived beyond his doctors’ prediction and would live on to see Muzan die.
• Kagaya Ubuyashiki explained that his clan had been cursed because Muzan was born from their bloodline, and he credited Su Chen with curing him.
• Kagaya Ubuyashiki revealed that Su Chen was the Demon Slayer Corps’ hope, prompting Muzan to demand to know where he was.
• Muzan admitted that he considered Su Chen a threat because his talent reminded him of Yoriichi Tsugikuni, then angrily insisted Su Chen was not worthy of comparison.
• Kagaya Ubuyashiki teased Muzan for being afraid and said Su Chen was simply the Demon Slayer Corps’ first Su Chen.
• A switch clicked inside the room.

Muzan survived the explosion at the Ubuyashiki estate, where Kagaya Ubuyashiki and his family died, and the Hashira gathered to attack him. Su Chen watched from a distance as Muzan appeared unconcerned, and Shinobu Kocho heard a faint stringed instrument just as the attacks reached him.

• Muzan realized Kagaya Ubuyashiki had filled the estate with explosives, and the blast engulfed Muzan, Kagaya, and Lady Amane.
• The Hashira arrived to find the estate burning and mourned Oyakata-sama, while Su Chen reached the scene and learned that Kagaya had sacrificed himself to lure Muzan out.
• Su Chen spotted the Stone Hashira fighting Muzan, with Tamayo stabbing the Demon King, and realized the final battle was beginning.
• Tanjiro Kamado and the assembled Hashira launched attacks using ten Breathing Styles as Tamayo confronted Muzan about her drug.
• Muzan sneered at the Hashira's assault, and Shinobu Kocho noticed his confidence before hearing a faint stringed instrument.

The Demon Slayer Corps members and Su Chen were pulled into the Infinity Castle, where Shinobu Kocho and Tokito explored separate areas and encountered signs of danger. Tanjiro tried to pursue Muzan, but Giyu Tomioka stopped him and said the Young Master was surveying the terrain.

• Windows opened beneath the Hashira, Corps members, Akaza, and Su Chen, pulling them into the Infinity Castle.
• Shinobu Kocho woke in the castle, searched for companions or enemies, and found a room filled with dead women and a figure holding an iron fan.
• Tokito explored the castle, was struck by a wooden beam into a vast space, and recognized the figure waiting there as his ancestor.
• After Muzan banished him twice, Tanjiro chased after him but Giyu Tomioka told him to follow orders.
• Giyu Tomioka pointed out a Dish Crow and explained that the Young Master had begun surveying the terrain.

Tanjiro and Giyu Tomioka fought Akaza in the Infinity Castle while Shinobu Kocho faced Doma and pierced his eye with a poisoned blade. Akaza insisted he was no longer Muzan’s ally, but he unleashed Destructive Death after the Hashira kept attacking him, and Tanjiro ordered him to stand down.

• Tanjiro and Giyu Tomioka found Akaza in the Infinity Castle and attacked him, despite Akaza’s insistence that Su Chen had already killed him and that he was no longer Muzan’s ally.
• Shinobu Kocho confronted Doma over her sister’s death and, using her Demon Slayer Mark, pierced his palm and eye with her Nichirin Blade.
• Doma’s eye and part of his head melted from Shinobu’s wisteria poison, but he regenerated and moved away from her.
• Tanjiro and Giyu Tomioka overwhelmed Akaza, whose strength had dropped after losing Muzan’s curse, while Tanjiro still treated him as an enemy because he remained a demon.
• Akaza unleashed Destructive Death, blasting through a distant wall, and Tanjiro shouted at him to stand down.

Su Chen arrived in the Infinity Castle and told Tanjiro and Giyu Tomioka to leave Akaza to him, then set off toward a distant cry after noticing Shinobu Kocho was in danger. Shinobu, badly wounded and unable to defeat Doma, prepared to use her final move.

• Su Chen appeared before Akaza, and Tanjiro and Giyu Tomioka arrived shortly afterward.
• Su Chen told Tanjiro and Giyu Tomioka that Akaza was not their enemy and sent them to help Tokito.
• Su Chen refused Akaza's offer to share Tamayo's plan and said he would kill Muzan himself.
• Akaza followed Su Chen as he flew through the Infinity Castle, while Su Chen sensed Akaza's blood reacting strangely to him.
• Su Chen heard someone murmur, "Doma, die!" and hurried toward the sound with Akaza following.
• Shinobu Kocho, gravely injured in Doma's pavilion, decided to use her final move.

Kanao Tsuyuri and Inosuke joined Shinobu Kocho against Doma, but Doma overwhelmed them and forced Shinobu to prepare to sacrifice herself. Su Chen arrived, saved Shinobu, and beheaded Doma, but as Su Chen struggled to recover, Akaza suddenly rushed toward Shinobu with killing intent.

• Kanao Tsuyuri and Inosuke attacked Doma, but his Blood Demon Art trapped everyone in ice.
• Shinobu Kocho charged at Doma and prepared to sacrifice herself by poisoning him.
• Su Chen appeared, caught Shinobu Kocho, treated her wounds, and told her to rest.
• Akaza fought Doma and called for Su Chen when Doma formed ice spears to kill him.
• Su Chen used Light Breathing: Light Ray Slash to melt Doma's ice and behead him.
• Akaza suddenly rushed toward Shinobu Kocho, and Su Chen sensed his killing intent.

Su Chen saw Muzan reactivate his curse and seize control of Akaza, who was about to kill Shinobu Kocho. He unleashed his powers to fight Akaza and established a connection that drew Muzan into his Memory Palace, where Muzan came face-to-face with him.

• Su Chen realized Muzan had reactivated Akaza’s curse as Akaza prepared to strike the badly injured Shinobu Kocho.
• Su Chen recalled his bond with Shinobu Kocho, embraced his demonic nature, and used four skills to slam Akaza into a wall.
• Su Chen silenced Muzan, expanded his domain, and called out to Akaza as he fought for control of his body.
• Su Chen exploited Akaza’s hesitation, attacked his heart, and used their connection to drain Muzan’s strength.
• Muzan was pulled into the Memory Palace, where he recognized the approaching Su Chen.

Su Chen killed Muzan inside his mental domain, but his body began to disintegrate until the fighting spirit of his allies and Shinobu Kocho’s pleas helped him recover. After completing his mission and eliminating every demon, Su Chen awakened beside Shinobu in the Butterfly Mansion.

• Su Chen used the Sun Dragon and Light Dragon to torment Muzan with memories of Yoriichi Tsugikuni and fear of Su Chen, then annihilated Muzan’s soul.
• Su Chen struggled to suppress his body’s demonic instincts as it began developing its own consciousness and falling apart.
• Shinobu Kocho, Kanao Tsuyuri, and the other allies sent their fighting spirit into Su Chen, slowing his body’s disintegration.
• Shinobu Kocho and Kanao Tsuyuri cried out for Su Chen to return as the Infinity Castle collapsed and the demons broke down.
• Su Chen’s mind cleared, and he fulfilled his mission with no demons remaining in the world.
• Su Chen awakened beside Shinobu Kocho in the Butterfly Mansion, where she welcomed him home.