Chapter Summaries

Giyu and Muichiro fought a soulless Akaza in the inverted labyrinth, where Akaza’s relentless attacks overwhelmed Giyu’s defense. As Akaza’s Annihilation Type threatened Muichiro, Muichiro imitated a spatial cut he had once witnessed and made ripples appear at his sword tip.

• Akaza attacked Giyu with a rapid barrage, eventually breaking through Dead Calm and knocking him into a wall with a blow that fractured his chest.
• Muichiro tried to strike Akaza from behind, but Akaza deflected his sword and countered with a punch.
• Giyu crossed the battlefield to shield Muichiro and ordered him to go, but Muichiro stayed.
• Akaza unleashed Annihilation Type at Muichiro, who recalled the man splitting a boulder by cutting through space.
• Muichiro abandoned the forms of Mist Breathing and imitated the change in the air he had seen, making faint spatial ripples appear at his sword tip as it touched Akaza’s fist.

Muichiro erased Akaza’s right arm with a fragment of Yaha’s power, disrupting Muzan’s control and restoring Akaza’s memories of Koyuki. As Akaza fell to his knees, Yaha turned his attention to the recovering Doma and prepared to attack.

• Muichiro used a spatial ripple to erase Akaza’s right arm, destroying part of Muzan’s control network.
• Muzan realized Muichiro had learned a fragment of Yaha’s law-altering power.
• Muichiro collapsed from the backlash, and Giyu stood between him and Akaza’s remaining attack.
• Akaza resisted Muzan’s commands, remembered Koyuki, and fell to his knees sobbing.
• Yaha withdrew his perception of the fight, then approached Doma as Doma tried to reassemble his ice Buddha.

Yaha annihilated Doma with his Cursed Technique Eight, giving Doma his first experience of fear, and absorbed a Cursed Object finger from his ashes. Yaha’s conflicting primordial essences then tore through his Cursed Markings, leaving him kneeling and unable to suppress the damage.

• Yaha unleashed Cursed Technique Eight, erasing Doma and the remaining ice in the ruined tatami room.
• Doma felt fear for the first time before the slashing grid reduced him to ash, and Yaha crushed the last piece of his skull.
• Shinobu Kocho watched Doma’s remains fade, silently grieving her sister while accepting that her vengeance was complete.
• Yaha gathered a dark red Cursed Object finger from Doma’s ashes and swallowed it despite the system’s warning of critical overload.
• The accumulated primordial essences clashed inside Yaha, tearing open his Cursed Markings and forcing him onto one knee as Shinobu Kocho noticed his distress.

Yaha lost control after absorbing Doma’s essence, but Shinobu calmed him by embracing him and using Insect Breathing to cool his body. Nakime reported the embrace to Muzan, who spat blood in frustration, and Yaha regained control before teasing Shinobu about her scorched waist.

• Doma’s essence overwhelmed Yaha, causing a phantom fourth arm and Cursed Markings to emerge as Sukuna’s bloodlust took hold.
• Shinobu dropped her blade, embraced Yaha, and used breath regulation to cool his skin and steady his instincts.
• Nakime saw the pair embracing through a surveillance probe and reported it to Muzan, who spat blood in frustration.
• Yaha’s phantom arm withdrew and his Cursed Markings receded as he regained control.
• Yaha released Shinobu, noticed the red marks on her waist, and teased her about trying to scald him.

Yaha hid the severe damage to his right hand, but Shinobu Kocho discovered it and bandaged it while ordering him not to conceal injuries from her again. When Yaha sensed the seventh seal awakening deep within the Infinity Castle, he and Shinobu Kocho headed downward to confront what Muzan had unleashed.

• Shinobu Kocho noticed Yaha's right hand twitching and pulled it from his pocket, revealing severe burns, exposed tissue, and dislocated fingers.
• Yaha told Shinobu Kocho that the damage began during a full-power test in the Swordsmith Village and had worsened each time he used the blade at full strength.
• Shinobu Kocho bandaged Yaha's hand and told him he was no longer allowed to hide injuries from her.
• Yaha sensed the seventh seal awakening deep within the Infinity Castle and recognized the change as something Muzan had unleashed.
• Yaha and Shinobu Kocho retrieved their weapons and headed down into the castle.

Yaha turned Nakime’s attempt to crush him into a law-level backlash that destroyed her biwa and injured Muzan. With the Infinity Castle’s spatial control halted, Yaha declared he was coming for Muzan.

• Nakime compressed the room around Yaha and Shinobu Kocho on Muzan’s orders.
• Yaha stomped through Nakime’s spatial connection and sent Dismantle’s law back to the control room.
• The backlash destroyed Nakime’s biwa, incapacitated her, and injured Muzan through their blood resonance.
• With Nakime down, the Infinity Castle’s shifting passages stopped, giving the scattered Hashira and demon slayers a chance to regroup.
• Yaha pointed his sword toward Muzan and announced that he was coming for him.

Hakuji resisted Muzan’s control and destroyed his demon core, dying as he reunited with Koyuki. Yaha carved a direct route through the Infinity Castle and encountered Upper Rank One, Kokushibo, with Shinobu Kocho beside him.

• Akaza remembered his human life as Hakuji and crushed his demon core, freeing himself from Muzan’s commands as he turned to ash and saw Koyuki.
• Giyu and Muichiro watched Hakuji disappear, then set off toward the ascending passage.
• Yaha carried Shinobu Kocho and used a full-power Cursed Technique Eight slash to cut through five ceilings, creating a vertical passage upward.
• Yaha and Shinobu Kocho reached a broad platform and sensed a chilling killing intent in the passage ahead.
• Kokushibo emerged with his blade drawn, and Yaha moved Shinobu Kocho behind him and prepared to face Upper Rank One.

Kokushibo attacked Yaha with Moon Breathing, but Yaha deflected the strikes while protecting Shinobu Kocho. When Kokushibo rushed in for a close-range kill, Yaha drew his black sword and met Kokushibo’s blade, leaving cracks in it as blood seeped through Yaha’s bandages.

• Yaha ordered Shinobu Kocho to stand back, and she recorded Kokushibo’s breathing and sword-draw movements with her poison needle.
• Kokushibo unleashed Moon Breathing, First Form-Dark Moon: Evening Palace, and Yaha used Dismantle to destroy or deflect most of the attack.
• A deflected moon blade flew toward Shinobu Kocho, so Yaha pivoted to shield her and sent the blade into the ceiling.
• Kokushibo rushed Yaha and aimed his sword at Yaha’s neck, but Yaha drew his black sword with his injured right hand and blocked the strike.
• Yaha’s sword held against Kokushibo’s full-strength blow, cracking Kokushibo’s blade as blood seeped through Yaha’s bandages.

Yaha used a zero-windup Cursed Technique Eight strike to wound Kokushibo despite the Transparent World, leaving Kokushibo to reveal a more monstrous form. Shinobu Kocho remained behind cover as the battle escalated.

• Kokushibo used the Transparent World to identify Yaha's injuries and attacked the weakness in his left ribs, but Yaha intercepted the strike with his left-handed sword and confused Kokushibo's reading of his cursed energy.
• Kokushibo unleashed moon blades that cut Yaha's shoulder and ear, while Yaha deliberately moved away from Shinobu Kocho to keep her out of danger.
• When Kokushibo forced Yaha to use his damaged right hand to block, Yaha briefly drew it before putting it back in his pocket, earning a roleplay level increase.
• Yaha withdrew his presence and struck with zero windup, using Cursed Technique Eight to cut Kokushibo's neck and cause spreading carbonization that resisted regeneration.
• Kokushibo closed and reopened his six eyes with dark purple irises, grew blood-colored eyes across his body, and enlarged his sword as Yaha welcomed the escalation.

Yaha defeated Kokushibo after enduring and dismantling his full Moon Breathing assault, and Kokushibo died reflecting on his past. As Yaha and Shinobu Kocho left the Training Ground, a heartbeat sounded from the thing sealed beneath the Seventh Layer.

• Kokushibo transformed and unleashed all his Moon Breathing forms at once, filling the platform with moon blades.
• Yaha walked through the attacks, reading their patterns, then used Cursed Technique Eight: Expansion to shatter the moon blades and Kokushibo's bone blades.
• Yaha confronted Kokushibo, who recalled the first time he saw his red-haired younger counterpart hold a sword, before turning to ash.
• Shinobu Kocho offered Yaha a porcelain bottle, but he declined, and the two left the Training Ground together.
• The ground and the Infinity Castle's walls shifted as the thing within the Seventh Layer Seal gave its first heartbeat.

After defeating Kokushibo, Yaha recovered an Origin Finger but Shinobu Kocho took it to keep him from worsening his injured right arm. When a gigantic demonized lifeform erupted beneath the Training Ground, Yaha rejected the System’s advice to flee and prepared to fight with his left hand.

• Yaha extracted an Origin Finger from Kokushibo’s ashes, but Shinobu Kocho took it after reading the System’s warning about his damaged right arm.
• Shinobu Kocho rebandaged Yaha’s injured hand as the ground began to pulse with unnatural vibrations.
• A huge hand burst from beneath the Training Ground, and the System warned that Muzan’s Seventh Layer Seal had been released.
• Tanjiro, Zenitsu, and Inosuke felt the vibrations elsewhere in Infinity Castle, while countless limbs and faces climbed from the pit.
• Yaha crushed the System’s warning, stood his ground, and drew his blade with his left hand as Shinobu Kocho readied her Nichirin Blade.

Yaha and Shinobu Kocho faced a growing mass of failed demon experiments sealed away by Muzan, whose core could harm Muzan if destroyed. As the creature overwhelmed the platform and regenerated new arms, Shinobu stepped forward with a plan to poison it.

• Yaha's System Panel identified the flesh mountain as an indestructible amalgamation containing primitive progenitor cells that could cause Muzan bloodline backlash if its core were destroyed.
• Yaha evaded the creature's attacks and used Dismantle to sever seven arms, but the flesh mountain grew fourteen new ones.
• Tanjiro, Zenitsu, and Inosuke arrived, and Tanjiro noticed Yaha was keeping his injured right hand hidden.
• Shinobu Kocho told Yaha to put her down and said she could kill the creature, then cut her palm and coated her Nichirin Blade with purple-black blood.
• The flesh mountain stopped moving and turned all its empty faces toward Shinobu as if it had caught her scent.

Shinobu Kocho poisoned Flesh Mountain’s core while Yaha cut it open and destroyed it, ending the demon’s growth and inflicting a backlash on Muzan. The group reunited on the ash-covered platform as the Infinity Castle shifted after something tore it open from above.

• Yaha cleared a path through Flesh Mountain’s arms while Shinobu Kocho identified its core, and Tanjiro, Inosuke, and Zenitsu guarded the platform from growing scraps of flesh.
• Shinobu Kocho ignored Flesh Mountain’s imitation of Kanae and thrust her wisteria-coated blade into the core, causing the demon’s tissue to rot and collapse.
• Yaha split open Flesh Mountain’s body and pierced its exposed core, stopping its heartbeat and completing its destruction.
• Muzan suffered a bloodline backlash in the Infinity Castle as Flesh Mountain’s ash settled over the Training Ground.
• Giyu, Muichiro, Rengoku, and Kanroji joined the others, then the Infinity Castle shifted as something at its highest level tore it open.

Yaha led the injured Demon Slayers to Muzan Kibutsuji, who revealed overwhelming speed and strength after they reached him. Muzan identified Shinobu Kocho as Yaha’s weakness and attacked Yaha while a poisoned blood spike crept toward Shinobu.

• Yaha covered his injured right hand and shoulder with Giyu’s haori, then cut a passage through the Infinity Castle so the group could climb toward the white space above.
• Yaha and the others found Muzan Kibutsuji seated on a black throne, and Tanjiro sensed that Muzan had seven hearts and five brains.
• Muzan struck Yaha back fifteen meters, then knocked Rengoku and Giyu away when they attacked him together.
• Muzan said Yoriichi Tsugikuni had been the only person besides Yaha to make him fear death, then declared that Yaha had a weakness and focused on Shinobu Kocho.
• Yaha moved in front of Shinobu as Muzan unleashed nine barbed whip-arms at him, while a poisoned blood spike emerged beneath Shinobu’s feet.

Yaha tried to keep Muzan occupied for thirty seconds so he could complete a one-handed cursed energy circuit and expand Malevolent Shrine. The Hashira and Tanjiro bought him time, and the chapter ended as the shrine appeared behind him and Muzan approached.

• A cursed marking on Shinobu Kocho's haori shielded her from Muzan's underground attack, and Yaha positioned himself in front of her.
• Yaha realized that Malevolent Shrine could strike Muzan's weakened soul, but he needed thirty seconds to form the domain's hand sign with his left hand alone.
• Rengoku, Giyu, Kanroji, Inosuke, Zenitsu, and Tanjiro attacked in turn to keep Muzan occupied while Yaha formed the cursed energy circuit.
• Muichiro severed Muzan's spatial path with his sword, stopping him long enough to give Yaha three more seconds.
• Yaha completed the one-handed circuit and summoned an enormous skeletal shrine as Muzan reached him.

Yaha expanded Malevolent Shrine across the Infinity Castle and repeatedly slashed Muzan, damaging his soul as well as his body. Muzan abandoned his human form to endure the attack while Yaha’s vessel neared collapse, leaving them racing to see who would die first.

• Yaha expanded Malevolent Shrine, which destroyed the upper floors of the Infinity Castle while sparing the humans caught inside.
• Muzan regenerated through repeated waves of slashes, but the attacks damaged his soul and left parts of his body, mind, and memories unusable.
• Muzan screamed in agony for the first time in a thousand years as he recognized Yaha’s overwhelming power.
• Rengoku noticed that Yaha’s left hand was burning and collapsing, and Yaha’s System Panel warned that his vessel had 47 seconds left.
• Yaha increased the domain’s slash density while Muzan compressed his remaining blood, hearts, and brains into a tumorous mass to endure the attack.
• Yaha gripped his sword and challenged Muzan to see which of them would die first.

Yaha consumed Kokushibo's Origin Finger, reached full synchronization with Ryomen Sukuna, and erased Muzan Kibutsuji with his domain. After the Demon Slayers realized they had won, the White Bone Shrine remained and Yaha's Roleplay Level began to fall as his new arm dissolved.

• Muzan expanded into a massive flesh wall while Yaha's domain shredded his organs, and Yaha's vessel countdown dropped as his left arm blackened.
• Shinobu Kocho ran through Yaha's exempted domain and pressed Kokushibo's Origin Finger to his lips, telling him to swallow it.
• Yaha consumed the Origin Finger, reached 100% synchronization with Ryomen Sukuna, and gained four solid arms as all restrictions were lifted.
• Yaha increased the domain's output and erased Muzan's body and soul until nothing remained.
• Yaha landed, and Shinobu Kocho called his new form ugly before he flicked her forehead; Tanjiro, Rengoku, and Giyu recognized that they had won.
• The White Bone Shrine remained as Yaha's Roleplay Level dropped from 100%, and his outermost arm began dissolving into black motes.

As the Infinity Castle collapsed, Yaha opened an exit to the human world and urged the injured Demon Slayers to escape. Shinobu Kocho stayed to carry him out, and they survived the fall; Yaha lay unconscious with his cursed markings and energy gone.

• The Infinity Castle began crumbling, and Yaha's arms and cursed energy started to disappear.
• Yaha slashed open an exit to the morning sky and told the injured Demon Slayers to leave.
• Rengoku, Kanroji, Inosuke, and Giyu helped the others escape, while Shinobu Kocho refused to abandon Yaha.
• Shinobu Kocho carried Yaha toward the exit as the floor collapsed, and Yaha used his remaining strength to protect her head during their fall.
• The survivors reached the grass, where Shinobu Kocho found Yaha alive but unconscious, with no cursed energy or cursed markings remaining.

Yaha woke after seven days of recovery, chose to unbind the system rather than continue pretending through its roleplay mechanic, and reunited with the Demon Slayer Corps. Three months later, he lived peacefully with his remaining friends and Shinobu Kocho, his powers diminished but his life his own.

• Shinobu Kocho confirmed that Yaha was alive and recovering, while the Demon Slayer Corps gathered at the Butterfly Mansion during his seven-day coma.
• Yaha woke, noticed Shinobu Kocho had cared for him, and told her to heat the meat before she announced his awakening to the others.
• Yaha chose to unbind the system, permanently shutting it down while keeping his physical enhancements and weakened cursed techniques.
• Three months later, Yaha watched the others train and eat at Mount Sagiri, then shared a quiet moment with Shinobu Kocho over grilled meat.