Arc 18Marks and the Demon War

Bai Yue helped Aoi face her fear, fought Gyutaro at the Swordsmith Village, and helped Tamayo return from her delusion. As marks emerged and Tamayo developed medicine to turn demons human, the Corps prepared for Muzan’s attack and Master Ubuyashiki’s rapidly worsening illness.

  • Bai Yue saved Kanae and Aoi during Final Selection, and Aoi later overcame her fear to defeat the Hand Demon with his help.
  • Tamayo’s blood caused the group to hallucinate, but Bai Yue helped her live through an imagined pregnancy and return to reality, where she resumed her research.
  • Bai Yue and Mitsuri went to the Swordsmith Village, where Daki and Gyutaro attacked, and Mitsuri awakened her mark, and Bai Yue fought Gyutaro with Blood Breathing.
  • Tamayo’s experiments and Bai Yue’s help led to marks surfacing on Shinobu, Kanae, Aoi, and others, while Mitsuri returned safely from the battle.
  • Tamayo, Kanae, and Shinobu received knowledge of a plan to create a virus that could weaken demons and gradually turn them human.
  • Muzan gave the Twelve Kizuki one month to find useful information, while Kagaya revealed that the Ubuyashiki family was related to Muzan by blood.
  • Bai Yue and Tamayo explained the curse and Kagaya’s short remaining lifespan, and the Corps planned medicine production, training, and a trap using Ubuyashiki headquarters, Tamayo, and Nezuko as bait.
  • Aoi oversaw medicine production at the Butterfly Mansion while postponing her mark experiment, then investigated a batch of medicine that had come out a different color.
Chapters 426–450 Vol. 5 Read

Ch. 426He Has an Eighteen-Wing Tattoo on His Back—A Mark? / Marks Are the Inscriptions of Espers

Bai Yue saved Kanae and the others from the oni attacking Mt. Fujikasane, then met the girls overseeing Final Selection. Kanae discovered an eighteen-wing mark on his back, and Hina Tsuyuri explained that the Corps’ records linked marks to extraordinary swordsmen.

  • Kanae protected the panicked Aoi from an oni’s ball, but a final fragment was stopped when the oni’s own head flew in front of her.
  • Bai Yue appeared amid the fallen oni, having defeated them with blood-coated spiked knuckle-dusters, and introduced himself to Kanae as her brother.
  • Bai Yue met Hina Tsuyuri and Ubuyashiki Hinana, who were overseeing Final Selection without guards, and questioned their acceptance of death as fate.
  • Five participants withdrew and two were killed; Kanae was declared qualified after she alone had turned back to strike the ball.
  • Kanae noticed an eighteen-wing mark covering Bai Yue’s back, and Hina Tsuyuri said the Demon Slayer Corps’ records associated marks with gifted individuals.

Ch. 427Kanao Kanzaki Still Stepped on It

Hina Tsuyuri explained the Demon Slayer marks and the danger they posed, while Bai Yue and the others took shelter at the selection cabin. Aoi Kanzaki massaged Bai Yue despite his fever and unusually tough muscles, and Kanae joined her as they watched over him.

  • Hina Tsuyuri told Kanae that marks appeared under life-threatening pressure, enhanced strength, and could shorten their bearers’ lives.
  • Bai Yue and the others went to the cabin where the Oyakata sisters stayed during Final Selection, while Kanae and the others were delayed by their medical supplies.
  • Bai Yue teased Aoi Kanzaki and asked her to massage him, but Kanae noticed his abnormally high temperature and gave him medicine.
  • Aoi Kanzaki massaged Bai Yue, eventually stepping on him to work through his tough muscles, and asked whether he could turn off his mark.
  • Aoi Kanzaki thanked Bai Yue for saving her, and Kanae offered to help massage him.

Ch. 428Kanao Witnesses the Chaotic Scene...

Aoi Kanzaki helped Bai Yue bathe and questioned him about his mark, his reported death, and his reincarnation. He demonstrated his regeneration by apparently killing himself, then revived and startled her with a playful lunge.

  • Aoi Kanzaki entered the bath to help bandage Bai Yue's injured hands, while Kanae offered to take over and Aoi warned her off.
  • Aoi examined the wing markings on Bai Yue's back and asked whether he had really killed half of the Twelve Kizuki and gained wings from his mark.
  • Bai Yue told Aoi that he had died and reincarnated into a body he had prepared through regenerative technology.
  • Bai Yue broke his own neck in front of Aoi, leaving her panicked when he appeared dead.
  • Bai Yue's body moved unnaturally and lunged at Aoi, then licked her face and revealed that he had only been scaring her.

Ch. 429She Definitely Wasn’t Sitting on Anything!

Aoi Kanzaki tried to explain to Kanae that an accidental fall and her later help tending to Bai Yue had not been what Kanae suspected. Just as Aoi blurted out what she had cleaned, she noticed Kanae signaling her to stop and looking behind them.

  • Aoi Kanzaki slipped on the wet floor and fell onto Bai Yue, and Kanae walked in on the chaotic scene.
  • At dinner, Aoi told Kanae she needed to explain the accident, while Kanae kept recalling what she had seen.
  • Aoi remembered that she had helped clean Bai Yue because his injured hands could not touch water.
  • Bai Yue greeted the Ubuyashiki sisters, who soon fell asleep together beneath blankets, and Aoi compared their courage to her own.
  • Aoi pulled Bai Yue and Kanae aside and explained the accident and her medical assistance, but Kanae’s gentle questioning led Aoi to blurt out what she had wiped.
  • Aoi noticed Kanae signaling her to stop and looking behind them.

Ch. 430Rejoining the [Demon Slayer Corps] Final Selection / Slaying the Hand Demon!

Aoi Kanzaki returned to Final Selection to face her fear of demons and capture one for Kanae’s experiments. After Bai Yue protected her from the Hand Demon, she fought back and severed one of its arms, but the demon attacked again.

  • Aoi Kanzaki reentered Mt. Fujikasane, determined to fight demons despite her fear and bring one back for Kanae’s experiments.
  • Aoi Kanzaki dodged a demon with blade-like arms, but the Hand Demon appeared and killed it with a sweeping blow.
  • Bai Yue shielded Aoi Kanzaki from the Hand Demon and was impaled by a sword, then urged her to hold it off while he recovered.
  • Aoi Kanzaki learned the Hand Demon had been imprisoned on the mountain for years and hated Sakonji Urokodaki and his students.
  • Aoi Kanzaki overcame some of her fear, attacked the Hand Demon, and cut off one of its arms before it struck again.

Ch. 431Tamayo’s Powers Run Wild

Aoi Kanzaki trusted her instincts and killed the oni, then discovered that Bai Yue’s apparent near-fatal injuries had vanished. Back at the cabin, she found him healthy and bathing, leaving her confused as Shinobu teased her about her feelings for him.

  • Bai Yue urged Aoi Kanzaki to trust her instincts as she fought the oni, and she cut off its arms and beheaded it.
  • Aoi Kanzaki found Bai Yue badly wounded, gave him emergency treatment, and ran to the cabin to fetch help.
  • At the cabin, Aoi Kanzaki learned that Kanae and the others were in the warehouse and saw Bai Yue emerge from the bathroom without a wound.
  • Aoi Kanzaki knocked Bai Yue down while checking his chest, and Shinobu and Kanae questioned the scene.
  • Bai Yue admitted that teasing Aoi Kanzaki was interesting, and Shinobu warned Aoi that he was harder to kill than Muzan.

Ch. 432Tamayo’s Delusion

At Mt. Fujikasane, Tamayo’s experiments and self-administered medicine caused her blood ability to overwhelm the people around her with delusions. While everyone remained trapped in visions of their deepest wishes, Tamayo’s hallucination led her to believe she had uncovered a way to bring her child back to life.

  • Aoi Kanzaki thanked Bai Yue for helping her face her fear, then agreed not to return to the Final Selection after Shinobu explained she had already proved herself.
  • Mitsuri Kanroji reported that Tamayo had injected herself with medicine and something had gone wrong, so everyone rushed to the warehouse.
  • Shinobu and the others were bewitched by Tamayo’s blood, while Tamayo herself fell under the influence of her uncontrolled ability.
  • Bai Yue saw that Nezuko, Kanae, and Aoi Kanzaki were each experiencing delusions of the family life they most desired.
  • In her hallucination, Tamayo believed she had learned the secret of Bai Yue’s regeneration and considered using her own cells to create a body for her dead child.

Ch. 433Kanae’s Gaze Gives Him Permission to Commit a Crime / Tamayo’s Goal Is to Collect—

Kanae and Bai Yue dealt with Tamayo’s blood-induced hallucinations after a demon attacked her, but Bai Yue suspected Tamayo had tampered with the medicine she used on him. As Tamayo waited for her plan to work, Shinobu woke and began to realize that her memories of a successful demon-to-human experiment had been a dream.

  • Kanae injected Tamayo with anesthetic after Tamayo’s blood caused the group to hallucinate, and Bai Yue helped move everyone into the cabin.
  • Tamayo apologized and resumed cleaning, while Bai Yue noticed she might have deliberately destroyed the medicine for external wounds.
  • Kanae treated Bai Yue with Tamayo’s replacement medicine, unaware that it contained a stimulant and that Tamayo had released blood to induce hallucinations.
  • Tamayo waited to see whether Bai Yue would fall asleep so she could collect what she wanted, but the sleeping drug seemed ineffective.
  • Shinobu woke in the cabin and recognized her memories of Tamayo successfully turning a demon into a human as a dream.

Ch. 434Mitsuri Kanroji Follows Him—and Makes a Shocking Discovery!

Shinobu confessed her feelings for Kanae’s beloved, and Kanae accepted her, while Mitsuri secretly followed Tamayo and discovered her investigating water and injecting an extract into herself. Bai Yue and Shinobu suspected Tamayo’s delusion ability was involved, but they did not explain her plan to Mitsuri.

  • Shinobu told Kanae she loved the same person Kanae did and feared coming between them, and Kanae assured her she could share in their happiness.
  • Mitsuri woke before dawn, found a note asking her to secretly observe someone, and followed Tamayo toward the bathroom drain.
  • Mitsuri watched Tamayo extract something from the wastewater, examine it under a microscope, and inject it into herself before speaking softly to an unseen presence.
  • Mitsuri reported what she had seen to Shinobu and Bai Yue, who discussed Tamayo’s lingering delusions and her possible plan.
  • Mitsuri asked what Tamayo was trying to do, but Shinobu and Bai Yue left her confused and feeling excluded.

Ch. 435The Nichirin Blade He Touches Becomes Like a Demon Sword / The Shy Girl Invites Him to Join Her...

Mitsuri Kanroji accompanied Bai Yue to Swordsmith Village, where his blood transformed a Nichirin Blade into a destructive black-red weapon before it returned to dull steel. Meanwhile, Kanae’s experiment appeared to turn a demon into a corpse, and she worried that Tamayo’s pregnancy would delay the medicine’s development.

  • Mitsuri Kanroji left to collect medical instruments from Swordsmith Village, and Bai Yue joined her at the carriage.
  • Mitsuri Kanroji brought Bai Yue to meet Tetsu'o Kawahara Chin'tetsu and showed him the ore used to forge Nichirin Blades.
  • Bai Yue’s blood heated the ore and transformed an unowned Nichirin Blade into a glowing black-red blade.
  • Bai Yue swung the transformed blade, blasting a distant mountainside, and the weapon faded back to dull steel-gray.
  • Kanae examined a demon that her medicine had seemingly turned into a lifeless human corpse while Tamayo remained lost in her fantasy.
  • Kanae’s younger sister asked whether they would have to wait around ten months for Tamayo to recover.

Ch. 436They’re Coming! Upper Rank Six!

Kanae and Shinobu tried to find a way to bring Tamayo back to her senses while the Swordsmith Village prepared a special Nichirin greatsword for Bai Yue. Daki discovered the village and approached to attack, interrupting Bai Yue and Mitsuri Kanroji at the hot spring as the villagers went on alert.

  • Kanae teased Shinobu about missing Bai Yue, then whispered an embarrassing question to her.
  • At the Swordsmith Village, Tetsu'o Kawahara Chin'tetsu decided to forge Bai Yue a blade from high-purity ore, and Bai Yue showed the swordsmiths his double-edged greatsword design.
  • Mitsuri Kanroji led Bai Yue to a hot spring, but he carried her back down the mountain after sensing an unwelcome guest nearby.
  • Daki, Upper Rank Six, found the Swordsmith Village and headed toward it, hoping to destroy it and earn praise.
  • Bai Yue noticed startled birds fleeing from Daki's direction, and the Swordsmith Village entered a state of readiness.

Ch. 437Split in Two—Two Upper Rank Fives!

Mitsuri Kanroji confronted Daki, an Upper Rank demon, at the Swordsmith Village and quickly cut her apart. Daki split into two opponents, and Mitsuri’s companion took one while Mitsuri prepared to face the other.

  • Mitsuri Kanroji learned that a likely Upper Rank demon had reached the Swordsmith Village, whose people were ready to defend it.
  • Daki attacked Mitsuri, who countered her obi and mocked Daki’s insults about her appearance.
  • Mitsuri used her Love Breathing forms to cut Daki apart and sever the threads connecting her head to her body.
  • A second figure emerged from Daki’s remains and attacked Mitsuri, but her companion struck it away and divided the fight between them.

Ch. 438Mitsuri Kanroji Awakens Her Mark / Creating—Blood Breathing

Mitsuri Kanroji fought Daki and awakened a heart-shaped mark as her strength and perception increased. Bai Yue battled Gyutaro with blood-infused weapons, then prepared to continue fighting hand-to-hand to improve his body's limits before facing Muzan.

  • Gyutaro emerged from Daki and shared his power with her, but Mitsuri broke through Daki's enhanced attacks again.
  • Mitsuri's growing excitement awakened a heart-shaped mark on her neck, and she beheaded Daki once more.
  • Gyutaro struggled against Bai Yue's blood-infused knives and forks, which burned and poisoned him, and recognized Bai Yue as the one who had killed Hantengu.
  • Bai Yue used up the weapons and decided to fight Gyutaro hand-to-hand to build his body's strength and extend a future transformation.

Ch. 439Upper Rank One’s Surprise Attack!

Bai Yue used a blood-based breathing technique to poison and weaken Gyutaro, pushing the demon close to death in their fight. As Bai Yue prepared a final strike, a wooden double door appeared behind Gyutaro, and he sensed a powerful presence beyond it.

  • Gyutaro attacked Bai Yue with his Blood Demon Arts, but his slashes collapsed and his body began to suffer from an internal poison.
  • Bai Yue explained that he had dispersed his blood and qi into the air, poisoning Gyutaro when he inhaled it, and named the method Blood Breathing.
  • Gyutaro wounded Bai Yue with a blood scythe, but Bai Yue's blood splashed onto him and further corroded his body.
  • Bai Yue struck Gyutaro's abdomen and moved to kill him as Gyutaro's weakened leg snapped.
  • A wooden double door appeared behind Gyutaro, and Bai Yue sensed a powerful presence before redirecting his final all-out strike.

Ch. 440Expanding the Twelve Kizuki! / Changes to Mitsuri Kanroji’s Heart-Shaped Mark

Gyutaro and Daki returned to the Infinity Castle after a brutal defeat, where Muzan investigated the blood-red crystals that had harmed Kokushibo and ordered the Twelve Kizuki expanded. At the Swordsmith Village, Bai Yue examined Mitsuri Kanroji and discovered that her mark enhanced catlike traits.

  • Kokushibo suffered intense pain after pulling a skeletal hand from his head, and Doma noticed blood-red crystals in the damaged flesh of Kokushibo, Gyutaro, and Daki.
  • Gyutaro explained that the siblings had encountered the strange crystals while attacking the Swordsmith Village, and Doma questioned whether Kokushibo had truly killed their enemy.
  • Muzan arrived, crushed a Lower Rank demon’s head, spared Gyutaro and Daki, and made the demon eat the crystals so he could examine their effects.
  • Muzan concluded that the crystals disrupted demon blood and regeneration, worried that Tamayo was experimenting with his blood, and decided the Twelve Kizuki needed more members.
  • As the Swordsmith Village prepared to evacuate at daybreak, Bai Yue examined Mitsuri Kanroji and found that her mark enhanced catlike physical traits, subtly changing her hair to resemble ears.

Ch. 441The Truth Behind the Girl’s Guilty “Chubbiness” Is Exposed

Mitsuri Kanroji’s awakened mark changed as Bai Yue reassured her about her hair, while the two shared an intimate moment. At Mt. Fujikasane, Kanae and Shinobu learned that Upper Rank One had killed Bai Yue at Swordsmith Village, then received an urgent correction to the report.

  • Mitsuri Kanroji asked whether fully awakening her mark could let her live longer, and Bai Yue told her about Tsugikuni Yoriichi surviving past eighty.
  • Mitsuri Kanroji worried that her sakura-colored hair would make her future children seem strange, and Bai Yue reassured her that it suited her.
  • Bai Yue showed Mitsuri Kanroji that the heart-shaped mark on her neck had turned sakura-colored, and they shared an intimate moment as she noticed her weight gain.
  • A crow told Kanae that two members of the Twelve Kizuki had attacked Swordsmith Village and that Upper Rank One had killed Bai Yue.
  • Shinobu questioned the crow about the attack and learned it had fled after witnessing Bai Yue’s death; another crow then arrived with a correction.

Ch. 442Successfully Turning a Demon Back into a Human! / Tamayo Gives Him a Look That Allows Him to Commit a Crime

Shinobu learned that Mitsuri and Yue were safe, then Mitsuri returned to Mt. Fujikasane and was embarrassed when the others realized what had happened during her journey. At the warehouse, a former demon appeared to have become human, while Kanae asked Yue to help Tamayo fulfill her delusion and recover her clarity.

  • Shinobu received updates that Mitsuri and Yue were unharmed and continued overseeing the Final Trial on Mt. Fujikasane.
  • Mitsuri returned with Yue, and Shinobu teased her about gaining weight before Yue’s embrace caused her to faint from embarrassment.
  • Kanae and Aoi discovered Mitsuri’s close-fitting clothing and realized that others knew about her intimate encounter with Yue.
  • Mitsuri and Aoi hurried to the warehouse, where Kanae said a demon appeared to have become human and Tamayo hoped Yushiro could recover too.
  • Kanae asked Yue to take Tamayo to rest, believing his help could let Tamayo fulfill her delusion and regain her clarity.

Ch. 443What Miss Tamayo Is About to Give Birth to Is...

Tamayo asked Bai Yue for the blood she believed she needed to revive her child, but he refused to die for her and instead agreed to cooperate with her. Meanwhile, Shinobu’s group returned from Final Selection and found a demon who had become human safely sitting in the sunlight at the cabin.

  • Tamayo asked Bai Yue for a large amount of his blood to replace hers and stop her delusions, but he refused to give it to her.
  • Bai Yue agreed to help Tamayo revive her child and revealed that he was interested in her; Tamayo silently accepted his advances.
  • Six candidates passed Final Selection, and Shinobu worried that the Demon Slayer Corps was losing members faster than it could replace them.
  • Shinobu and the others secretly escorted the candidates partway down the mountain before leaving the Ince Unit to continue watching them.
  • At the cabin, Shinobu found a woman who had returned to being human and had spent the morning safely in sunlight; Kanae said the woman planned to join the Butterfly Mansion.
  • Mitsuri burned food while daydreaming, and Aoi scolded her for failing to watch the fire.

Ch. 444Nezuko Turns into a Super-Toddler

Bai Yue guided Tamayo through her delusion of pregnancy and childbirth, while Kanae reassured her that they could be happy together. As Tamayo’s imagined labor began, Nezuko shrank into a tiny toddler to stand in for the newborn, leaving the others scrambling to help.

  • Aoi kept Kanae, Nezuko, and Shinobu away from the cabin while Bai Yue helped Tamayo fast-forward through her imagined pregnancy.
  • Kanae told Tamayo they could be happy together instead of separating after the child was born.
  • Tamayo began to go into labor, and Shinobu prepared a wooden doll as a fake baby.
  • Nezuko transformed into a tiny toddler, and Shinobu carried her into Tamayo’s room as a more convincing stand-in.
  • Kanae urgently called for a bucket, and Mitsuri rushed to fetch one but was splashed along with Shinobu.

Ch. 445The Mark-Awakening Experiments Will Be Wonderful / You Can Awaken the Mark by Getting So Worked Up You Faint

Tamayo emerged from her delusions after Bai Yue accompanied her through decades in her spiritual world, and she resolved to resume researching how to turn demons back into humans. Bai Yue then tested his theory about awakening marks through intense sparring, leaving Shinobu’s mark clearer but still unstable.

  • Tamayo apologized to Bai Yue for her willfulness and said she had awakened and would no longer run away.
  • Tamayo returned to reality in the mountain cabin, thanked Kanae and the others, and resolved to continue her research.
  • Tamayo explained that she had become something like Nezuko, while Bai Yue described her as transforming into a New Human.
  • Bai Yue proposed testing whether intense experiences could activate marks and sparred with Shinobu.
  • Shinobu lost to Bai Yue seven times, and her butterfly-shaped mark grew clearer but faded somewhat when she rested.

Ch. 446Everyone Watches Shinobu's Mark-Awakening "Experiment"

Kanae asked Aoi and Kanao whether they would accept Yue’s intimate method for awakening their marks instead of undergoing dangerous training. Aoi agreed, and Kanae asked her to explain the method to a stunned Kanao.

  • Kanae called Aoi and Kanao aside and asked whether they wanted to awaken their marks quickly.
  • Kanae asked Aoi what she thought of Yue and explained that his method might help them become stronger before the coming battles.
  • Aoi blushed but agreed to try the method, while Kanae reassured her that she would not mind.
  • Kanae told Aoi to explain the method to Kanao, who froze and then blushed when she understood.
  • Kanae asked Kanao whether she was willing to try it.

Ch. 447Conditions for Awakening the Mark: Body Temperature of 39°C, Heart Rate Above 200 / The Chaotic Mark Awakening Experiment

Kanae Kocho and Tamayo studied how intense stimulation affected the Demon Slayer marks, finding that Shinobu’s mark became clearer when her temperature neared 39°C and her heart rate exceeded 200. The experiment also revealed a faint mark in Kanae’s pupil, while the chapter ended with another participant’s mark fully surfacing.

  • Aoi Kanzaki and Kanae discussed their feelings for Bai Yue, and Kanae asked Kanae Kocho to decide what she should do.
  • At the cabin, Kanae Kocho, Tamayo, and Aoi observed Shinobu’s experiment and recorded the observers’ physical measurements.
  • Shinobu’s temperature rose to about 39°C and her heart rate exceeded 200, making her butterfly-shaped mark surface before it faded again as she fainted.
  • Aoi spotted a faint mark in Kanae’s right pupil, and Kanae Kocho confirmed that it changed during the experiment.
  • During a later experiment, Shinobu reported that the current subject’s heart rate exceeded 200 as Tamayo measured a temperature nearing 40°C, and the subject’s four-leafed flower-petal mark surfaced completely.

Ch. 448Becoming a God Again, Injecting Into the Girls...

Shinobu helped awaken Kanae’s mark during the experiment, while Aoi and Tamayo also became involved in the group’s mark research. Elsewhere, Nezuko revealed her fire ability, and Bai Yue began another blood-replacement experiment to become a true esper.

  • Shinobu teased Kanae during the mark-awakening experiment, and Kanae’s mark became clearer as Shinobu’s poison-related ability was revealed.
  • Tamayo recorded the experiment while Aoi developed an incomplete mark, and Shinobu urged Tamayo to join the experiment to increase its resonance.
  • Nezuko used her ability to set damp firewood alight as Mitsuri helped her and the Oyakata sisters prepare dinner.
  • Mitsuri approached the experiment room and heard the commotion inside, while the Oyakata sisters developed faint marks after hearing it.
  • Bai Yue began replacing his blood with Tamayo’s again and told Kanae not to anesthetize him so his thoughts would remain unaffected.

Ch. 449The Ubuyashiki Family’s Age-Old Grudge Against Muzan Kibutsuji

Tamayo, Nezuko, Kanae, and Shinobu received specialized knowledge from Bai Yue, including a plan to use a virus to turn demons back into humans. Meanwhile, Muzan threatened the Twelve Kizuki with a one-month deadline, and Kagaya Ubuyashiki revealed that his family was related to Muzan by blood.

  • Tamayo sensed Muzan’s transformation, and crimson mist became a white-winged figure that gave knowledge to her, Nezuko, Kanae, and Shinobu.
  • Tamayo, Kanae, and Shinobu learned a plan to create a virus that would weaken demons and gradually turn them back into humans.
  • Muzan berated the Twelve Kizuki for failing to find the Blue Spider Lily or the person he had ordered them to locate, then gave them one month to produce useful information.
  • Kanae could not treat Kagaya’s worsening illness, and Sanemi suggested turning him into a demon before Kyojuro punched him.
  • Kagaya stopped the argument and explained that the Ubuyashiki family was related to Muzan by blood.

Ch. 450The Truth Behind the Curse; Everything Is Ready; The Final Battle Is Near! / Kanao’s Stubbornness

Bai Yue explained that the Ubuyashiki family's illness came from the hatred of Muzan’s victims and that killing Muzan would only gradually weaken the curse. With medicines ready and the Corps preparing a plan to draw Muzan out, the chapter ended at the overwhelmed Butterfly Mansion as Aoi’s assistants reported a problem with medicine production.

  • Bai Yue told the Hashira that the Ubuyashiki curse came from the dead victims of Muzan and would fade only gradually after Muzan’s death.
  • Tamayo said Master Ubuyashiki had at most two months to live, and confirmed that medicines for combating oni had been developed.
  • Master Ubuyashiki agreed to mobilize his family’s resources as the Corps planned mass medicine production, further training, and a trap using the Ubuyashiki headquarters, Tamayo, and Nezuko as bait.
  • Aoi Kanzaki managed the Butterfly Mansion’s medicine production while postponing her mark experiment, and Kanae pursued separate training to activate her mark.
  • Three of Aoi’s assistants reported that a batch of medicine had come out a different color, and Aoi told them to explain calmly.
Arc 18 of 30