Chapter Summaries

Yuichiro and Muichiro encountered Upper Rank One, Kokushibo, in the Infinity Castle after Tamayo ordered Yushiro to distribute concealment talismans. Kokushibo revealed their Tsugikuni ancestry and offered to turn them into demons before attacking them.

• Yuichiro and Muichiro heard that Akaza had been slain and hurried through the Infinity Castle to find an Upper Rank demon.
• Yushiro treated Zenitsu, then made concealment talismans at Tamayo’s direction and sent Kakushi members and Kasugai Crows to distribute them to the swordsmen.
• Yuichiro and Muichiro entered a vast chamber and found Kokushibo waiting in the shadows.
• Yuichiro taunted Kokushibo, while Muichiro drew his sword and gave their names.
• Kokushibo recognized the brothers’ Tsugikuni blood, offered to turn them into demons, and drew his sword.
• Kokushibo vanished and launched a rapid, wide-ranging attack at the brothers.

Muichiro and Yuichiro fought Kokushibo but were overwhelmed and knocked unconscious. Gyomei Himejima and Sanemi Shinazugawa arrived in time to save them, and Sanemi began battling Kokushibo.

• Muichiro and Yuichiro combined their Breathing techniques to defend against Kokushibo and launch coordinated attacks, but he read their movements with the Transparent World.
• Kokushibo unleashed Moon Breathing, Third Form, disarmed both brothers, and left them unconscious on the floor.
• As Kokushibo prepared to pin the brothers down, Gyomei Himejima and Sanemi Shinazugawa burst through the ceiling and drove him back.
• Sanemi attacked Kokushibo with Wind Breathing, and the two exchanged sword strikes before Sanemi launched another close-range assault.

Kokushibo overwhelmed Gyomei Himejima and Sanemi Shinazugawa with his complete Moon Breathing, leaving both badly wounded. Genya and Muichiro intervened, and Muichiro stabbed Kokushibo with a Bright Red Nichirin Sword, prompting Kokushibo to retaliate with a deadly horizontal slash.

• Kokushibo transformed his sword and unleashed powerful Moon Breathing attacks that wounded Gyomei Himejima and Sanemi Shinazugawa.
• Genya Shinazugawa ate Kokushibo's hair, gained demonic strength, and fired a bullet that wrapped around Kokushibo's sword and struck his shoulder.
• Muichiro regained consciousness, turned his Nichirin Blade bright red through his grip, and used Mist Breathing to reach Kokushibo unnoticed.
• Muichiro drove his Bright Red Nichirin Sword into Kokushibo's flank, slowing his movements and burning his cells.
• Kokushibo ignored his wound and swept his greatsword at Muichiro, intent on cutting him in half.

Yuichiro, Genya, Muichiro, Sanemi, and Gyomei restrained Kokushibo long enough for Sanemi and Gyomei to behead him. As Kokushibo’s consciousness faded, he remembered his childhood as Tsugikuni Michikatsu and the moment he first saw Yoriichi’s extraordinary swordsmanship.

• Yuichiro blocked Kokushibo’s strike against Muichiro, while Genya’s Blood Demon Art trees bound Kokushibo and drained his blood.
• Muichiro’s Bright Red Nichirin Sword further immobilized Kokushibo as Yuichiro held down his enormous sword.
• Sanemi attacked Kokushibo’s neck with his Bright Red Nichirin Sword, and Gyomei struck Sanemi’s blade with his red Meteor Hammer to sever Kokushibo’s head.
• As Kokushibo’s consciousness faded, he recalled being Tsugikuni Michikatsu, the elder twin destined to inherit the family leadership, while Yoriichi was meant to become a monk.
• Michikatsu remembered inviting Yoriichi to train with a bamboo sword and watching him defeat an elite warrior instantly by striking his weak points.

Michikatsu recounted how envy of his younger brother Yoriichi drove him to join the Demon Slayer Corps, become a demon to escape the Mark’s curse, and pursue greater strength. When Yoriichi died after defeating him with one slash, Michikatsu’s resentment erupted and he cut his brother’s corpse in two.

• Yoriichi left for a temple, gave Michikatsu a wooden flute, and told him to take care of their ill mother; Michikatsu later inherited leadership of the family.
• Years later, Yoriichi saved Michikatsu and his subordinates from a demon, prompting Michikatsu to abandon his family and join the Demon Slayer Corps.
• Michikatsu failed to master Sun Breathing, developed Moon Breathing, and awakened a Demon Slayer Mark that threatened to kill him before age twenty-five.
• Fearing death before he could surpass Yoriichi, Michikatsu accepted Muzan Kibutsuji’s offer and became a demon.
• Yoriichi confronted Michikatsu fifty years later and stopped his sword at Michikatsu’s neck before dying of old age.
• Enraged that Yoriichi had outlived the Mark and defeated him again, Michikatsu slashed his brother’s corpse in two.

Kokushibo survived beheading by transforming into a more monstrous demon, but seeing his reflection made him question the obsession that had sustained him. As Gyomei Himejima and Sanemi Shinazugawa attacked, Kokushibo crumbled into ash, leaving the surviving Demon Slayers exhausted and wounded.

• Kokushibo regrew his head after Gyomei Himejima and Sanemi Shinazugawa beheaded him, while the exhausted Demon Slayers were unable to redden their blades again.
• Kokushibo saw his monstrous reflection in Sanemi Shinazugawa's blade and remembered his brother Yoriichi, realizing he had abandoned everything without surpassing him.
• Sanemi Shinazugawa and Gyomei Himejima attacked Kokushibo while he stood dazed, striking his body but missing his neck.
• Kokushibo's body cracked and dissolved into ash, and his demon blade scattered after falling to the ground.
• Sanemi Shinazugawa collapsed and asked Genya Shinazugawa if he was alive; Genya answered that he had survived, while Gyomei Himejima knelt and murmured the Buddha's name.

Sanemi and Genya reconciled as the medicine delivered by a Kasugai Crow stabilized Genya and Muichiro. Meanwhile, Takanashi Rokuno learned that Upper Rank One had fallen and led Kanae and Shinobu toward Muzan for the final battle.

• A Kasugai Crow delivered Shinobu's pale blue medicine, and Genya used it to stop Muichiro's bleeding and suppress his own injuries.
• Genya apologized to Sanemi for the misunderstanding about their mother, and Sanemi embraced him, admitting he had only wanted him to live safely.
• Takanashi Rokuno sensed that Upper Rank One's demonic aura had vanished and concluded that the Hashira had won.
• Rokuno praised Shinobu's medicine, then led Kanae and Shinobu deeper into the Infinity Castle to confront Muzan.

After the Demon Slayer Corps gathered to prepare for Muzan, his presence erupted through the Infinity Castle, signaling that he had awakened. Rokuya led the charge toward him, but the platform he stepped onto suddenly shot upward.

• Genya reconciled with Sanemi, while Muichiro survived his injuries but remained unconscious.
• A Kasugai Crow announced that the Stone, Wind, Mist, and Smoke Hashira and Genya had slain Kokushibo.
• Rokuya ordered the surviving Demon Slayers to gather at the central platform, where the wounded and other fighters assembled.
• Zenitsu told Rokuya that Yushiro had gone to find the demon controlling the Infinity Castle, while Tamayo was occupied with an important task.
• Muzan's presence erupted through the castle, and Rokuya ordered everyone to follow him toward Muzan's position.
• As Rokuya stepped onto a new platform, the demon controlling the Infinity Castle sent it shooting upward.

Rokuya was trapped on a high platform by the demon controlling the Infinity Castle and warned the others not to pursue him. Muzan attacked the gathered Demon Slayer Corps members below, while Tanjiro struggled to stop one of his thorn whips.

• Rokuya realized Muzan had isolated him high above the others and shouted instructions for them to hold their position while Yushiro searched for the demon controlling the Infinity Castle.
• Kanae and Shinobu worried about Rokuya, while Kyojuro led the group in forming a defensive circle around the wounded.
• Muzan appeared before the Demon Slayer Corps and declared that he would kill them now that Rokuya was trapped.
• Muzan sent bladed thorn whips toward the gathered swordsmen, and Tanjiro's attempt to slash one back drove him several steps backward.

The injured Hashira struggled to withstand Muzan’s assault until Obanai Iguro and Mitsuri Kanroji joined the defense and awakened Bright Red Nichirin Swords, briefly suppressing Muzan’s regeneration. Meanwhile, Yushiro searched the Infinity Castle and found the female demon controlling it fused into its walls.

• Gyomei Himejima, Sanemi Shinazugawa, Kyojuro Rengoku, Kanae Kocho, and Shinobu Kocho were forced back by Muzan’s rapid attacks.
• Obanai Iguro and Mitsuri Kanroji entered the fight and coordinated their attacks to protect the injured Hashira.
• Mitsuri Kanroji and Obanai Iguro turned their blades bright red and severed Muzan’s tentacles, slowing his regeneration and reminding him of Yoriichi Tsugikuni.
• Muzan’s fear turned to rage, and he intensified his attacks until Obanai Iguro and Mitsuri Kanroji could only defend themselves.
• Yushiro used his Blood Demon Art to search the Infinity Castle and spotted a female demon fused with its wooden walls.

Yushiro tried to reach Nakime but was driven back as she rearranged the Infinity Castle and attacked the Kasugai Crows. Muzan overwhelmed the Hashira with a new berserk transformation, and Rokuya, trapped above the battlefield, broke down as he watched his allies suffer.

• Yushiro identified Nakime as the source controlling the Infinity Castle and ran toward her, but she shifted rooms and corridors to push him away and struck down several Kasugai Crows.
• Obanai Iguro and Mitsuri Kanroji neared defeat against Muzan until Kyojuro Rengoku, Sanemi Shinazugawa, Gyomei Himejima, Kanae Kocho, Shinobu Kocho, and Tanjiro coordinated to defend them and briefly force Muzan back.
• Muzan transformed into a more powerful berserk state, destroyed the Hashira's defensive formation, and wounded Shinobu Kocho and Kanae Kocho as the others struggled to hold him off.
• Takanashi Rokuno watched the battlefield from an isolated platform and saw Shinobu Kocho and Kanae Kocho injured while the other Hashira were in danger.
• Rokuya unleashed his Arcana Power and repeatedly slashed at the platform and spatial barriers, but Nakime's castle repaired itself faster than he could break through.

Yushiro navigated the Infinity Castle’s shifting spaces and used the Kasugai Crows to locate Nakime again in its central depths. Meanwhile, Tanjiro, Inosuke, Zenitsu, Sanemi, and Gyomei coordinated their attacks against Muzan, leaving him briefly paralyzed and his defenses damaged.

• Yushiro exploited the brief pauses between Nakime’s spatial changes to cross the Infinity Castle and reach her former hiding place, but found she had already moved.
• Yushiro reconnected with surviving Kasugai Crows and spotted Nakime inside an inverted shrine deep in the castle, then rushed after her.
• Tanjiro called on Inosuke and Zenitsu to match his rhythm as Muzan’s tentacles attacked them from several directions.
• Tanjiro dodged Muzan’s tentacles with Hinokami Kagura, and Inosuke carved a deep gash into one of them with Beast Breathing.
• Zenitsu struck Muzan’s neck with Thunder Breathing, briefly stiffening him, and Sanemi used the opening to sever three tentacles.
• Gyomei began an attack with Stone Breathing as the fight against Muzan continued.

Tanjiro and the Hashira briefly overwhelmed Muzan, but his sonic boom incapacitated them and he regenerated while preparing to destroy the battlefield. Takanashi Rokuno then plunged from a platform above, leaving the Demon Slayers fearing he would die before reaching Muzan.

• Gyomei, Kyojuro Rengoku, Obanai Iguro, and Mitsuri Kanroji coordinated their attacks and severed Muzan's limbs and tentacles.
• Muzan unleashed a sonic boom that injured and scattered Tanjiro, Sanemi, Gyomei, Kyojuro Rengoku, Kanae Kocho, and Shinobu Kocho.
• Muzan regenerated his severed limbs and gathered his strength for an attack that would cover the battlefield.
• Inosuke spotted Takanashi Rokuno falling from hundreds of meters above, and Kanae and Shinobu feared he would be killed by the fall.
• Takanashi Rokuno recalled seeing the battle below and rapidly considered how to stop Muzan's impending attack.

Rokuya leaped from the platform to attack Muzan, using the force of his fall to make Mortal Punisher trigger. He decapitated Muzan and crashed into the Infinity Castle, but emerged unharmed, leaving Kanae and Shinobu relieved to find him alive.

• Rokuya abandoned his plan to reset Bright Moon's cooldown and bought Mortal Punisher instead.
• Rokuya fell without activating Demon Form and used Sun Breathing, Clear Blue Sky, to slash through Muzan's neck.
• Rokuya's impact shattered multiple floors of the Infinity Castle and left him, Muzan's body, and Muzan's head in a deep pit.
• Kanae, Shinobu, Tanjiro, Sanemi, and Gyomei believed Rokuya had died and rushed toward the pit.
• Rokuya called up from the pit, then stood unharmed after Mortal Punisher absorbed the lethal damage.

Rokuya survived his fatal plunge, and Yushiro brought the Infinity Castle aboveground, exposing Muzan to the night sky with two hours until sunrise. As Tanjiro held Muzan’s severed head apart from his body, Rokuya spent his remaining Gratitude Points to reset Invincible Might and transformed into the Dawn Guardian.

• Rokuya used his famed blade’s passive effect to survive the fall, then reassured Kanae and Shinobu that he would stay alive.
• Rokuya recognized that Yushiro had taken control of Nakime, and Yushiro forced the Infinity Castle through the ground into the open air.
• A Kasugai Crow announced that sunrise was two hours away, and Muzan’s damaged body and severed head emerged from the castle.
• Rokuya pulled the Shura Blade from Muzan’s head and ordered Tanjiro to keep the head from rejoining the body; Tanjiro pinned it down with his blade.
• Rokuya used all his remaining Gratitude Points to reset Invincible Might’s cooldown and transformed into the Dawn Guardian.

Rokuya used his eight-minute Invincible Might to overwhelm Muzan, while Tamayo's drug stopped Muzan from splitting apart to escape. After Rokuya's power ran out and left Muzan nearly depleted, the Hashira and swordsmen charged in to finish the fight.

• Rokuya activated Invincible Might and battered Muzan, repeatedly destroying his body while conserving Muzan's hearts from direct strikes.
• Muzan tried to split into pieces to flee, but Tamayo revealed that her drug had locked his cells together and prevented his escape.
• Rokuya continued attacking Muzan for the full eight minutes, draining most of his energy and slowing his regeneration.
• Rokuya's transformed state ended, and he told the others to keep attacking before Muzan could recover or escape.
• Sanemi, Gyomei, Kyojuro Rengoku, Obanai Iguro, Mitsuri Kanroji, Inosuke, and Zenitsu joined the attack on Muzan.

Rokuya healed Kanae and Shinobu with Tamayo’s rare medicine while the Demon Slayer Corps held Muzan off until sunrise. Muzan was destroyed by the sun, and the victorious swordsmen celebrated Rokuya’s role in their success.

• Rokuya used two doses of Tamayo’s medicine to heal Kanae and Shinobu, reassuring them that their health mattered most to him.
• The Demon Slayer Corps kept attacking Muzan and prevented him from escaping as the eastern sky brightened.
• Sunlight burned Muzan until his body collapsed into ash, ending his thousand-year existence.
• The swordsmen cheered, embraced, and wept after Muzan’s death.
• The swordsmen lifted Rokuya onto their shoulders and tossed him into the air as Kanae and Shinobu watched proudly.

After Muzan's death, Kagaya Ubuyashiki recovered from his family's curse and thanked Rokuya for saving them. Rokuya declined wealth and status, asking instead to marry Shinobu and Kanae, live peacefully, and educate retired swordsmen; Kagaya promised to provide a residence and fund a school.

• Kagaya Ubuyashiki's curse markings faded, his breathing cleared, and his sight returned after Muzan's death.
• The Kakushi Corps cleared the battlefield and brought the wounded Hashira and swordsmen to the Butterfly Mansion, where Kanae Kocho and Shinobu Kocho oversaw their treatment.
• Rokuya visited Kagaya Ubuyashiki, and Kagaya, Amane, and their children bowed to express the Ubuyashiki Clan's gratitude.
• Kagaya offered Rokuya wealth or status, but Rokuya said he wanted to marry Shinobu and Kanae, live peacefully, and teach retired swordsmen.
• Kagaya promised to build a scenic residence with space for Rokuya's household and a school, with the Ubuyashiki Family covering the costs.

With the demons gone, the former Demon Slayer Corps members celebrated their freedom, and Kagaya Ubuyashiki formally disbanded the Corps. Two months later, Rokuya married Kanae and Shinobu at a lavish ceremony, leaving with his wives to begin their new life.

• Tanjiro and his family enjoyed time together at the Butterfly Mansion while the surviving swordsmen and their companions relaxed and celebrated.
• Rokuya announced a victory banquet, where Kagaya Ubuyashiki disbanded the Demon Slayer Corps and promised to help its members find secure work.
• Rokuya announced that he would marry Kanae and Shinobu in two months, drawing cheers from the banquet guests.
• Kagaya Ubuyashiki officiated Rokuya, Kanae, and Shinobu's wedding at a new mansion, and all three exchanged their vows.
• Rokuya carried Kanae and Shinobu out of the hall as the guests cheered.