Chapter Summaries

Lin Yoriichi obtained drugs from Miss Tamayo that could induce specific dreams and let him enter another person's dreams. Meanwhile, Kokushibo confronted Muichiro Tokito and Gyomei Himejima, then joined a demon assault on the Butterfly Mansion after Muzan Kibutsuji ordered him to kill everyone inside.

• Miss Tamayo explained that her blood could create a drug that induced specified dreams and that combining her blood with Lower Rank One Nightmare's blood could let Lin Yoriichi enter another person's dreams.
• Kokushibo appeared near the Butterfly Mansion and confronted Muichiro Tokito, recognizing his Tokito surname and the Transparent World, Demon Slayer Mark, and Breathing Style he had mastered.
• Gyomei Himejima joined Muichiro Tokito, and Kokushibo revealed that he had once been Tsugikuni Michikatsu and that Muichiro was his descendant.
• Muichiro Tokito and Gyomei Himejima attacked Kokushibo, but he dodged them and moved toward the Butterfly Mansion.
• Gyomei Himejima sensed a large group of demons approaching the Butterfly Mansion, while Muzan Kibutsuji ordered Kokushibo to join the attack and kill every swordsman inside.

Kokushibo fought Gyomei Himejima and Muichiro Tokito as they defended the Butterfly Mansion, while Muzan Kibutsuji urged him to break through. As Kokushibo charged again, three new figures entered the battlefield.

• Gyomei Himejima attacked Kokushibo with his flail and axe, but Kokushibo drew his sword and knocked both weapons aside.
• Muichiro Tokito emerged from a mist technique and deflected Kokushibo's strike, allowing Gyomei Himejima to recover his weapons and continue defending the mansion.
• Kokushibo used Moon Breathing against Gyomei Himejima, damaging Gyomei's flail while his own sword gained a notch.
• Muzan Kibutsuji ordered Kokushibo to enter the mansion, and Kokushibo recognized that Gyomei and Muichiro had mastered the Demon Slayer Mark and Transparent World.
• Kokushibo charged toward the Butterfly Mansion again, but three figures joined the battlefield.

Kokushibo faced five Hashira who had ambushed him using the Transparent World, but Muzan Kibutsuji’s blood helped him grow stronger during the fight. The Hashira turned their blades bright red and launched a combined attack, but Kokushibo emerged with the numeral in his eye changed to “Zero.”

• Muzan Kibutsuji ordered Kokushibo to keep fighting the five Hashira, believing their arrival was an opportunity to weaken the Demon Slayer Corps.
• Kokushibo recognized that the Hashira had learned the Transparent World from Yoriichi Tsugikuni, then attacked Muichiro Tokito as Sanemi Shinazugawa, Obanai Iguro, and Mitsuri Kanroji countered him.
• Kokushibo unleashed Moon Breathing, Fifth Form: Moon-Sickle Vortex, forcing Obanai Iguro and Mitsuri Kanroji back as the Hashira realized his power was increasing.
• Kokushibo’s eye numeral began to fade as he absorbed more of the blood Muzan Kibutsuji had given him, and his strengthened attack injured Sanemi Shinazugawa’s hand.
• Gyomei Himejima urged the Hashira to turn their blades bright red, and all five joined together in an attack against Kokushibo.
• Kokushibo emerged from the dust with Moon Breathing, Seventh Form: Mirror of Misfortune, Moonlit, and the numeral in his eye changed to “Zero.”

Kokushibo transformed into Upper Rank Zero and attacked the Hashira, but resisted Muzan Kibutsuji’s orders long enough to acknowledge the spirit Yoriichi Tsugikuni had taught them. As the Hashira fought to protect the Butterfly Mansion, Muzan seized tighter control of Kokushibo and raged at his defiance.

• Kokushibo emerged from the dust with horns and the rank of Upper Rank Zero, forcing Gyomei Himejima to change the plan and call for the Hashira to hold him off until sunrise.
• Muzan Kibutsuji revealed that he had sent demons to attack civilians and ordered Kokushibo to use the Hashira’s concern for others against them.
• Kokushibo redirected his Moon Breathing, Eighth Form: Moon Dragon Ringtail toward the Hashira and the Butterfly Mansion, but the five Hashira blocked it despite their injuries.
• Kokushibo resisted Muzan long enough to praise the Hashira and recognize the spirit Yoriichi Tsugikuni had passed on to them.
• Kokushibo unleashed Moon Breathing, Fourteenth Form: Fierce Transformation, Heaven-Filling Slender Moon, while the Hashira charged to protect the Butterfly Mansion and Sanemi Shinazugawa judged the attack manageable.
• Muzan Kibutsuji furiously accused Kokushibo of defying his will.

The nine Hashira fought Kokushibo, whose body Muzan Kibutsuji controlled, and their improved skills and teamwork overwhelmed his attacks. With all nine assembled and Yoriichi Tsugikuni still absent, Muzan realized his plan had failed and ordered Kokushibo to retreat just as a dark red blade flashed toward them.

• Gyomei Himejima, Sanemi Shinazugawa, Muichiro Tokito, Mitsuri Kanroji, and Obanai Iguro held off Kokushibo's weakened attacks and struck at his neck.
• Shinobu Kocho poisoned Kokushibo, while Muzan Kibutsuji discovered that the demons attacking the Butterfly Mansion had mostly been defeated.
• Tengen Uzui fought his way to the Hashira and slashed Kokushibo's neck.
• Giyu Tomioka pinned Kokushibo's sword arm, and Kyojuro Rengoku wounded him with Flame Breathing.
• All nine Hashira assembled, prompting Muzan Kibutsuji to recognize that his plan had failed and order Kokushibo to retreat.
• A flash of dark red blade light struck as Kokushibo began to withdraw.

Muzan Kibutsuji watched Yoriichi sever Kokushibo's head through Kokushibo's eyes, but Kokushibo survived by using replacement organs and fled with his head. As the Hashira and Lin Yoriichi pursued, Muzan ordered Nakime to open a passage for Kokushibo.

• Muzan Kibutsuji recalled how he had tracked Tamayo and used demons as alarms to monitor Yoriichi Tsugikuni while arranging the attack on the Butterfly Mansion.
• Yoriichi Tsugikuni arrived and severed Kokushibo's head, making Muzan relive his terror of Yoriichi's blade.
• Kokushibo's replacement organs took over his head's functions, and he grabbed his severed head while continuing to flee.
• Gyomei Himejima and Sanemi Shinazugawa noticed Kokushibo's transformation, and the Hashira joined Lin Yoriichi in pursuing him.
• Muzan Kibutsuji ordered Nakime to open a passage, and a biwa sounded as the passage appeared before Kokushibo.

Lin Yoriichi entered Kokushibo’s memories and saw Tsugikuni Michikatsu finally understand Yoriichi Tsugikuni’s words about the paths people pursue. As Lin Yoriichi’s blade pressed against Kokushibo’s chest, Kokushibo accepted that he had reached the same spiritual realm as his brother.

• Muzan Kibutsuji panicked when Yoriichi Tsugikuni approached the Infinity Castle passage and ordered Nakime to close it.
• Lin Yoriichi crushed Tamayo’s dream-connecting drug, freezing Kokushibo and entering his memories.
• Lin Yoriichi watched Yoriichi Tsugikuni tell Tsugikuni Michikatsu that people who pursue their paths to the end reach the same destination.
• Lin Yoriichi witnessed Michikatsu become Kokushibo and later cut Yoriichi Tsugikuni’s corpse in half beneath the red moon.
• Lin Yoriichi memorized details of the Infinity Castle and saw Kokushibo find joy in the Hashira’s courage and distinct Breathing Styles.
• With Lin Yoriichi’s blade against his chest, Kokushibo realized he had finally understood Yoriichi Tsugikuni and reached his realm.

Muzan Kibutsuji visited the pharmaceutical tycoon’s household to learn what its researchers had discovered about the Blue Spider Lily. He learned the flower was a painted white spider lily and overheard that someone had deliberately spread the reports, but the chapter ended before he heard the person’s name.

• Muzan Kibutsuji entered the tycoon’s home through Nakime’s passage and confronted the demon posing as his adopted child.
• Muzan Kibutsuji listened as the people outside discussed developing a treatment for the child’s illness and the flower he had provided for study.
• The tycoon’s associates revealed that their botanists had revived the flower, identified it as an ordinary white spider lily, and found blue pigment on its remains.
• Muzan Kibutsuji grew furious as the people outside said the Blue Spider Lily reports had misled them and cost him Doma and Akaza.
• Muzan Kibutsuji heard that someone had deliberately promoted the reports, and his breathing stopped as the speaker began to mention a name.

Muzan Kibutsuji recognized Kagaya Ubuyashiki’s Blue Spider Lily lead as bait and retreated to the Infinity Castle, where he realized he had no safe way to find the flower or escape Yoriichi Tsugikuni. Meanwhile, Lin Yoriichi’s restoration rate rose to 85% after Kokushibo’s death, and he wondered whether Muichiro Tokito could access memories of their ancestors.

• Muzan Kibutsuji ordered Nakime to return him to the Infinity Castle, dismissed the prostrating demon, and shut the passage.
• Muzan Kibutsuji considered his fruitless search for the Blue Spider Lily and admitted that he had killed the doctor who could have told him more about it.
• Muzan Kibutsuji abandoned the idea of outliving Yoriichi Tsugikuni because Yoriichi had returned from death once before.
• Lin Yoriichi helped the Demon Slayer Corps handle the aftermath of Kokushibo’s death and found that his restoration rate had reached 85%.
• Lin Yoriichi considered the Corps’ strength against Muzan Kibutsuji, then wondered whether Muichiro Tokito could dream of his ancestors’ memories like Tanjiro.

Lin Yoriichi used Tamayo’s medicine to help Muichiro Tokito recover his memories by entering his dream. As the dream gradually stabilized, Lin Yoriichi saw the fantastical forms Muichiro’s memories gave to the people around him, and was left startled by Giyu Tomioka’s appearance.

• Muichiro Tokito agreed to let Lin Yoriichi help restore his memories, and Shinobu Kocho and Gyomei Himejima supported his choice.
• Lin Yoriichi gave Muichiro Tokito Tamayo’s medicine and entered his fragmented dream, where memory gaps restricted his movement.
• As the medicine took effect, Lin Yoriichi saw Amane Ubuyashiki remembered as a fairy and Gyomei Himejima as a bear.
• Lin Yoriichi encountered dream versions of Shinobu Kocho, Kyojuro Rengoku, Mitsuri Kanroji, Obanai Iguro, Sanemi Shinazugawa, and Tengen Uzui as animals.
• Lin Yoriichi saw how Muichiro Tokito remembered Giyu Tomioka and reacted with surprise.

Lin Yoriichi entered Kyojuro Rengoku’s memories, hoping to meet his ancestor Yoriichi Tsugikuni, after seeing Muichiro Tokito recover some of his memories. The chapter ended as Kyojuro’s memories carried Lin back to the moment he met Yoriichi Tsugikuni.

• Lin Yoriichi saw himself represented as a faceless shadow in Muichiro Tokito’s memories, and Muichiro explained that he had appeared blurry because he habitually remained in the Transparent World.
• Lin Yoriichi asked Muichiro Tokito to summon Kyojuro Rengoku, then entered Kyojuro’s memories with the Drug.
• Lin Yoriichi witnessed Kyojuro Rengoku and Senjuro Rengoku discuss their father’s renewed resolve to train after speaking with Mr. Yoriichi.
• Lin Yoriichi saw Kyojuro Rengoku ask his mother’s grave whether he had done well after becoming a Hashira.
• Kyojuro Rengoku’s memories jumped back to his ancestor, leading Lin Yoriichi to meet Yoriichi Tsugikuni.

Lin Yoriichi watched the Rengoku Family Ancestor’s memories of Yoriichi Tsugikuni’s life, learning how he taught Breathing Styles and how Kokushibo’s betrayal led to Yoriichi leaving the Demon Slayer Corps. The memories raised Lin Yoriichi’s restoration rate to 88%, and he resolved to face problems with his own methods rather than try to become Yoriichi Tsugikuni.

• Lin Yoriichi saw Yoriichi Tsugikuni discover that a demon had killed his wife and unborn child, then watched the Rengoku Family Ancestor help him arrange the funeral.
• Lin Yoriichi spotted Blue Spider Lilies near the grave on Mount Kumotori and suspected Yoriichi Tsugikuni had met the Kamado family’s ancestor there.
• Lin Yoriichi watched Yoriichi Tsugikuni join the Demon Slayer Corps and teach its swordsmen Breathing Styles, helping them develop techniques suited to themselves.
• Lin Yoriichi saw Tsugikuni Michikatsu join the Corps, become Kokushibo, and kill Sun Breathing successors and the Oyakata-sama before Yoriichi left the Corps.
• Lin Yoriichi left Kyojuro Rengoku’s dream and found that his restoration rate had risen by 3% to 88%.
• Lin Yoriichi reaffirmed that he would solve current threats himself, strengthen his teammates, and drag hidden opponents into the sunlight.

Tanjiro Kamado and Goto found Blue Spider Lilies blooming briefly on Mount Kumotori, while an unseen observer watched them. Muzan Kibutsuji learned the flowers might be connected to Tanjiro’s family and decided to send a demon to investigate rather than risk leaving the Infinity Castle himself.

• Tanjiro Kamado told Goto that Blue Spider Lilies existed and recalled his family making them into pickles.
• Tanjiro Kamado showed Goto blue buds that bloomed into Blue Spider Lilies in the sunlight before quickly withering.
• Tanjiro Kamado and Goto left to pack his things, and an eyeball appeared in the shadows after they departed.
• Muzan Kibutsuji’s five brains debated whether the flowers were real and whether the Demon Slayer Corps had set a trap.
• Muzan Kibutsuji considered going to Mount Kumotori but decided to send a demon instead.

Muzan Kibutsuji searched for the Blue Spider Lilies on Mount Kumotori, but they had rotted away, and the only surviving flower decayed as soon as he dug it up. After considering whether the rotted remains could still help him overcome sunlight, he was discovered near the Kamado family's house by Sakonji Urokodaki.

• Muzan Kibutsuji sent a two-horned demon to Mount Kumotori after checking that Yoriichi Tsugikuni and the Demon Slayer Corps were elsewhere.
• Muzan Kibutsuji found the Blue Spider Lilies rotted into sludge and watched the last apparently living flower decay after he dug it up.
• Muzan Kibutsuji wondered whether eating the rotted remains might help him overcome sunlight and planned to test them on the two-horned demon.
• Sakonji Urokodaki sent a message reporting a demon near the Kamado family's house, then took up his Nichirin Blade.

Sakonji Urokodaki ambushed the demon collecting the Blue Spider Lilies on Mount Kumotori, forcing Muzan Kibutsuji to open a passage to the Infinity Castle. Muzan reached through to seize the demon’s corpse and soil, and a dark red blade appeared as Urokodaki attacked his arm.

• Sakonji Urokodaki rushed to the mountaintop to ambush the demon collecting the Blue Spider Lilies and buy time for the others.
• Muzan Kibutsuji controlled the two-horned demon to keep digging while he planned to study the lilies’ remains and reproduce them.
• Sakonji Urokodaki pinned the demon’s wrist with a Water Breathing thrust, then severed both its arms as Muzan hesitated.
• Muzan Kibutsuji summoned Nakime to open a passage and reached through to scoop up the demon’s corpse and surrounding soil.
• Sakonji Urokodaki slashed Muzan’s arm but barely wounded it, and a dark red blade silently appeared.

Yoriichi Tsugikuni cut off Muzan Kibutsuji's arm and slipped into the Infinity Castle before Nakime could close its entrance. Muzan realized Yoriichi had entered only after he was beheaded.

• Yoriichi Tsugikuni severed Muzan Kibutsuji's mutated arm as Sakonji Urokodaki watched in shock.
• Nakime closed the Infinity Castle passage just as Yoriichi Tsugikuni reached it, and Muzan believed he had been kept outside.
• Muzan convinced himself the Infinity Castle was safe and began planning to hide there and eventually leave Japan.
• Muzan recalled the Mirage Sun Rainbow sword form and wondered if Yoriichi had used it to slip inside, then dismissed the possibility.
• Yoriichi appeared behind Muzan and beheaded him in an instant.

Muzan Kibutsuji fled through the Infinity Castle while Nakime tried to trap Lin Yoriichi in a layered structure, unaware that Lin had already escaped and was planting locator knives to help Yushiro. The chapter ended as Muzan saw Lin suddenly appear behind Nakime.

• Muzan grew two heads and two extra legs, then fled on all fours while ordering Nakime to trap Lin Yoriichi.
• Nakime played her biwa furiously and wrapped Lin's platform in layers of rooms, forming a huge enclosed structure.
• Lin had already used Mirage Sun Rainbow to leave an afterimage, concealed himself with the Transparent World and Yushiro's talisman, and began planting simplified Blood-Draw Knives around the Infinity Castle.
• Muzan slowed down, believing the structure would delay Lin if he escaped, but then saw Lin appear behind Nakime.

Yushiro appeared in the Infinity Castle and attacked Nakime, but Muzan Kibutsuji broke through the rooms she summoned to reach him. Yoriichi Tsugikuni revealed he had never been trapped, cut off Muzan Kibutsuji’s heads, and pursued him as Muzan transformed into a many-legged, many-headed creature; Nakime then teleported the wall Muzan was crawling on directly in front of Yoriichi.

• Muzan Kibutsuji warned Nakime when Yushiro suddenly appeared beside her and attacked her head.
• Nakime’s disrupted biwa summoned rooms in Muzan Kibutsuji’s path, but he smashed through them while charging toward Yushiro.
• Yoriichi Tsugikuni appeared before Muzan Kibutsuji and revealed he had been waiting outside the rooms all along.
• Yoriichi Tsugikuni severed Muzan Kibutsuji’s heads, but Muzan grew new heads and legs and fled in a bizarre spider-like form.
• Nakime played her biwa and teleported the wall Muzan Kibutsuji was crawling on directly in front of Yoriichi Tsugikuni.

Muzan Kibutsuji repeatedly fled Yoriichi Tsugikuni's attacks through Nakime's Infinity Castle, but Yushiro kept teleporting him back into range. Muzan finally escaped in a finger-sized form, killed Nakime, and charged at Yushiro.

• Lin Yoriichi slashed Muzan Kibutsuji, shattering much of his body and leaving dark red burn marks that slowed his regeneration.
• Muzan Kibutsuji used Nakime to teleport away, but Yushiro redirected him back to Yoriichi Tsugikuni, who struck the same scar again.
• Muzan Kibutsuji tried to split apart to escape, but Yushiro's control of Nakime brought him back into Yoriichi's reach, and another slash reduced him to a fragment around his heart.
• Muzan Kibutsuji divided into a finger-sized form, regenerated without Yoriichi's old scars, and decided Nakime had to die.
• Muzan Kibutsuji killed Nakime as she played her biwa, and the finger-sized demon charged at Yushiro.

Muzan Kibutsuji escaped Yoriichi Tsugikuni and Yushiro through the Infinity Castle, then tried to hunt humans so he could recover his strength. He arrived at the pharmaceutical tycoon’s home, where the Hashira ambushed him, and decided to flee again.

• Muzan Kibutsuji stole Nakime’s biwa and used it to send Yoriichi Tsugikuni and Yushiro through separate passages.
• Muzan Kibutsuji opened a passage to the pharmaceutical tycoon’s home, planning to eat the tycoon and use his identity to gather employees as food.
• Muzan Kibutsuji found the demon he had posed as the tycoon’s son dead and crumbling to ash.
• Kyojuro Rengoku attacked Muzan Kibutsuji with Flame Breathing, and Muzan realized the Hashira had gathered to ambush him.
• Muzan Kibutsuji recognized that he was weakened after splitting apart and decided to run.