Chapter Summaries

Yaha confronted Shinobu after discovering she had been poisoning herself so Upper Rank Two would kill her by eating her. When she admitted her plan and broke down over her sister’s death, Yaha prepared to purge the toxins from her body and gave her a choice: cooperate or be restrained.

• Yaha dragged Shinobu to the Butterfly Mansion and destroyed a medicine cabinet filled with concentrated wisteria poison.
• Yaha examined Shinobu and revealed she had been poisoning herself for thirty-seven days, leaving her organs with irreversible damage.
• Shinobu admitted she planned to let Upper Rank Two eat her so the poison in her body would kill him from within.
• Shinobu tearfully explained that her sister’s death and her inability to defeat demons had driven her to make the sacrifice plan.
• Yaha told Shinobu he would not let her die and formed a sphere of reverse cursed energy to purge the poison, ordering her to sit still or be restrained.

Yaha used Cursed Technique: Dismantle and Reverse Cursed Technique to transform Shinobu Kocho’s wisteria poison, healing her body and making her more poisonous to demons without sacrificing her life. As Shinobu went to prepare his meal, a large fissure opened above the Butterfly Mansion, and Yaha prepared to confront the demon presence within it.

• Yaha restructured the wisteria poison in Shinobu Kocho’s body, restoring her health and increasing the poison’s potency against demons.
• Yaha told Shinobu she could kill Upper Rank Two without dying, and she broke down in relief before asking how he wanted his meat cooked.
• Shinobu noticed Yaha’s trembling hand but said nothing, then left to prepare the meal.
• Yaha checked his injured hand and judged that three days would be enough for it to recover.
• A wide purple fissure opened above the Butterfly Mansion, releasing a demon aura, and Yaha reached for his sword as Shinobu looked on.

A rift to the Infinity Castle opened above the Butterfly Mansion, and Yaha stopped it from swallowing the courtyard with a casual slash. The rift remained partly open, and Yaha chose to leave it as a warning to Muzan.

• The widening rift pulled people and debris from the Butterfly Mansion courtyard, and Tanjiro's Sun Breathing slash failed to reach it as a Hidden Corps member was dragged inside.
• Yaha casually drew his New Blade and sent a Cursed Technique: Dismantle slash through the rift, stopping the suction and rescuing the Hidden Corps member.
• Yaha's slash shrank the rift by two-thirds but did not close it, while Nakime recognized the attack's spatial laws and Muzan watched in fear.
• Tanjiro compared his failed attack with Yaha's effortless slash, and Yaha asked Shinobu Kocho for more apples.
• Shinobu Kocho pointed out that the rift remained open, and Yaha told her to leave it so Muzan could see how deeply his New Blade could cut.

Yaha shattered Muzan's dimensional rift with a casual sword strike, and the slash crossed into the Infinity Castle, wounding Muzan and destroying his stone table and floor. Yaha returned to the Butterfly Mansion and predicted that Muzan would open the castle the next day.

• Yaha used his sword to cut apart the rift above the Butterfly Mansion, freeing the Hidden Corps members and ending the suction.
• Yaha's lingering slash crossed dimensions into the Infinity Castle, cut Muzan's face, and carved a long trench through the castle floor.
• Muzan ordered Nakime to seal the castle, then changed his plan and commanded her to open it tomorrow.
• Yaha returned to the Butterfly Mansion, confirmed that his slash had hit Muzan, and told Shinobu Kocho that Muzan would open the door the next day.

After using powerful attacks against the spatial rift, Yaha’s right hand was badly damaged, while Muzan ordered Nakime to unseal the dangerous seventh layer. At the Butterfly Mansion, Muichiro stayed watch outside Yaha’s room and quietly asked Shinobu whether Yaha’s hand was injured.

• Tanjiro, Inosuke, and Zenitsu watched Yaha return to his room after his slash failed to reach the rift.
• Yaha found dark cracks across his right hand and a numb ring finger, and his Reverse Cursed Technique healed them only slowly.
• Muzan failed repeatedly to regenerate the wound on his face and killed demons who approached him.
• Muzan ordered Nakime to open the seventh layer, and a heartbeat sounded from the sealed darkness.
• Shinobu treated Muichiro’s inflamed forehead wound while he kept watch outside Yaha’s room.
• Muichiro asked Shinobu whether Yaha’s hand was injured, and she looked toward the closed door without answering.

Shinobu Kocho treated Yaha’s burned right hand as he rested at the Butterfly Mansion, but an attack began before the hand had healed. Yaha and Shinobu headed out to face the rifts opening above the mansion as Tanjiro, Zenitsu, and Inosuke rushed into the corridor.

• Shinobu Kocho brought Yaha roasted meat and applied ointment to the burns on his right hand.
• Yaha’s ring finger moved slightly as his Reverse Cursed Technique aided the healing.
• A high-pitched hum alerted Yaha and Shinobu Kocho that an enemy was about to attack.
• More than a dozen rifts opened above the Butterfly Mansion, and the Kasugai Crows shrieked in alarm.
• Yaha seized the New Blade and went toward the courtyard as Tanjiro, Zenitsu, Inosuke, and Shinobu Kocho followed.

Yaha calmed the Demon Slayers as dark rifts opened above the Butterfly Mansion, dismissing their panic and declaring that he would enter the Infinity Castle and kill Muzan. As the group prepared to follow him, corrosive purple slime began seeping through the rifts and dissolving the courtyard stones.

• Kasugai Crows sounded an alarm as dark-purple rifts appeared above the Butterfly Mansion, drawing Rengoku, Mitsuri, Giyu, Tanjiro, Zenitsu, Inosuke, and other slayers into the courtyard.
• Yaha arrived with tea, mocked the panicking slayers, and told the envoy to burn Oyakata-sama's deployment maps because he would go in and kill the rat himself.
• Yaha told the slayers to eat, drink, and be ready to tear down the Infinity Castle with him, and the group began preparing for the assault.
• Giyu noticed that Yaha's hand was moving irregularly inside his pocket but chose not to mention it.
• A drop of dark-purple slime fell from a rift and dissolved a hole through a courtyard flagstone, leaving Tanjiro to realize that something other than spatial distortion was seeping into their world.

At the Butterfly Mansion, the Demon Slayers shared a meal while waiting outside Yaha’s room, and Muichiro’s offering prompted Yaha to accept food without acknowledging him. The meal ended as an invisible force began slicing through the courtyard, leaving everyone in immediate danger.

• Shinobu prepared a large meal as Mitsuri asked about her relationship with Yaha, and Shinobu called it “caretaker and beast.”
• The Demon Slayers ate in the courtyard while Tanjiro and Giyu watched Yaha’s closed door and Muichiro waited outside it through the night.
• Muichiro left rice and roasted meat at Yaha’s threshold and said he would watch Yaha even if he would not teach him.
• Yaha pulled the food inside, ate it despite his injured hand, and listened to the meal’s sounds from his room.
• A soup bowl cracked along a smooth, silent line, and Tanjiro realized the ground beneath the courtyard was being sliced apart.

As Infinity Castle’s spatial laws began tearing through the Butterfly Mansion, Yaha assigned the Hashira and Tanjiro’s group their roles for the coming assault. Shinobu Kocho refused to stay behind, and as the sky shattered overhead, Yaha secretly marked her before announcing the enemy had arrived.

• Cracks spread through the courtyard as Giyu identified them as Infinity Castle’s spatial laws probing the mansion’s coordinate anchors.
• Yaha ordered Rengoku to lead Tanjiro, Zenitsu, and Inosuke forward, assigned Giyu and Muichiro to clear their path, and gave the other Hashira defensive roles.
• Yaha told Shinobu Kocho to remain inside the barrier, but she refused, insisting that avenging her sister was her decision; he relented after confronting her with his Spiritual Pressure.
• Yaha secretly placed a Cursed Marking on Shinobu Kocho’s haori as he returned to the courtyard.
• Fissures widened across the sky above the Butterfly Mansion, darkness swallowed the moon and stars, and Yaha gripped his New Blade and declared that it had arrived.

Yaha and the Demon Slayer Corps faced rifts tearing apart the Butterfly Mansion, and Yaha shielded them from the suction with a temporary barrier. As the barrier began to fail, he discovered the rifts overhead were a decoy and the true openings were forming beneath their shadows.

• Dark purple rifts opened above the Butterfly Mansion and began dismantling the building while pulling everyone skyward.
• Giyu offered Yaha his Nichirin Blade, but Yaha rejected it, told him not to die, and continued forward.
• When the ground was torn away, Yaha anchored himself and raised a barrier that stopped the suction for fifteen seconds.
• Yaha warned everyone to hold on to one another before the barrier broke and they were pulled inside.
• Yaha noticed rifts opening beneath everyone's shadows and revealed that the openings above were a decoy.

Nakime scattered the Demon Slayers across the Infinity Castle, and Yaha failed to keep Shinobu Kocho from being pulled into a rift. As he fell into the castle, his killing intent surged and his cursed markings spread.

• Nakime opened seven rifts beneath the courtyard and separated Tanjiro, Zenitsu, Inosuke, Rengoku, Mitsuri, Giyu, and the others.
• Shinobu Kocho caught Yaha's sleeve as the ground vanished beneath her, and he grabbed her wrist with his damaged right hand.
• Shinobu Kocho saw Yaha's injuries and held his hand with both of hers as the rift's pull overwhelmed them.
• Yaha lost his grip, and Shinobu Kocho disappeared into the closing rift after silently telling him, "I'll wait for you."
• Yaha gripped the New Blade with his shattered hand and let the collapsing island carry him into the Infinity Castle.
• Yaha's cursed markings spread across his face as he vowed that Nakime had touched something she shouldn't have.

Yaha tore a direct route through the Infinity Castle, destroying its demons and barriers as he searched for Shinobu. He found her reflection in a shattered piece of space, standing opposite a smiling figure with rainbow-colored eyes.

• Yaha accelerated through the teleportation passage and crashed into the seventh level of the Infinity Castle, destroying the surrounding corridor.
• Yaha found that the castle’s spatial laws limited his perception to fifty meters and prevented him from locating Shinobu.
• Yaha killed more than a hundred demons with Cursed Technique Eight, damaging the castle’s structure in the process.
• Yaha used Dismantle to cut through the Infinity Castle’s barriers and carve a straight passage through it.
• Yaha saw Shinobu in a reflection, facing a smiling figure with rainbow-colored eyes, then crushed the fragment as cursed energy cracked the ground around him.

Yaha continued slashing through spatial barriers as the Demon Slayers were separated across the Infinity Castle and confronted with powerful demons. Shinobu faced Doma alone, while Zenitsu sensed a vast living presence beneath the castle.

• Yaha accelerated his assault on the spatial barriers, snapping a tendon in his left wrist but refusing to stop.
• Rengoku and Mitsuri faced a magma-dwelling Sewing Abomination, and Rengoku blocked its acid attack as its many arms reached for their platform.
• Tanjiro and Inosuke spotted invisible spatial faults in a shifting-gravity chamber, while Zenitsu heard a huge, slow heartbeat deep beneath the Infinity Castle.
• Giyu and Muichiro confronted an altered Akaza, who shattered Giyu's Dead Calm defense and cracked Muichiro's collarbone with a glancing blow.
• Shinobu drew her blade against Doma after he recalled tasting her sister and said Muzan had ordered him not to let her escape alive.

Yaha abandoned his original route and cut through the Infinity Castle toward Shinobu Kocho after recognizing Muzan’s attempt to lure him with images of her. His newly strengthened slashes brought him to a sealed, monstrous mass blocking the passage to the tatami room, and he prepared to test his New Blade against it.

• Yaha compressed Cursed Technique Eight onto his blade and began slicing through hundreds of meters of the Infinity Castle with each swing.
• Mirror shards showed Shinobu Kocho fighting Doma, and Yaha realized Muzan was using her image to steer him into a trap.
• Yaha deliberately changed direction toward Shinobu’s tatami room, raising his roleplay level and loosening a restriction on Open.
• Yaha’s fire-charged slashes grew stronger and stopped Nakime from repairing the castle as he cut down toward its lower levels.
• Yaha reached the fleshy Seventh Layer and found a huge creature made from fused demons blocking the passage to the tatami room.
• Yaha grinned and prepared to test whether his New Blade could wield Open at full power against the creature.

Shinobu fought Doma with a new curse-like poison that melted his shoulder and forced him to sever his arm. As a dark red pillar of fire tore through the Infinity Castle toward them, Shinobu prepared to keep attacking Doma before the man who had healed her arrived.

• Shinobu faced Doma without her former resolve to die, and Doma noticed that her scent had changed.
• Shinobu stabbed Doma with a newly made poison that ignored his demon regeneration and began dissolving his shoulder.
• Doma retreated and severed his left arm to stop the poison from spreading, then began regenerating while asking about the man who prepared it.
• A dark red pillar of fire tore through the Infinity Castle toward the room, and Shinobu recognized the approaching man's power.
• Shinobu told Doma he still had time to run before the man arrived, then prepared to attack with most of her poison still in her blade.

Yaha destroyed the Sewing Abomination with a full-power Open slash that carved a tunnel through three layers of the Infinity Castle. He sensed real cold and heard Shinobu Kocho’s laugh ahead, then vowed to punish whoever had touched his Caretaker.

• The Sewing Abomination attacked Yaha with a mass of tentacles and Blood Demon Arts, but his Cursed Energy field pulverized them.
• Yaha drew his sword and unleashed Open at full power, erasing the Sewing Abomination and burning a tunnel through three connected layers of the Infinity Castle.
• Yaha noticed the release had aggravated the damaged energy channels in his right hand, though he judged the pain would not hinder him.
• Yaha entered the burned tunnel and felt real cold spreading from the direction of a Japanese-style room.
• Yaha heard Shinobu Kocho’s distant laugh, gripped his sword, and declared that he would retaliate against whoever had touched his Caretaker.

Shinobu Kocho fought Doma after her curse stopped his regeneration, but his clones trapped her and his Ice Spear nearly reached her heart. Just before it struck, the marked swordsman burst into the room and confronted Doma.

• Doma discovered that Shinobu Kocho's curse destroyed the rules governing his regeneration.
• Doma created twenty-three Ice Crystal Clones, and Shinobu Kocho destroyed several while evading their attacks.
• The remaining clones pinned Shinobu Kocho in place as Doma launched an Ice Spear at her heart.
• A blast of heat melted through the eastern wall and vaporized the spear before it hit Shinobu Kocho.
• The marked swordsman entered the ruined room and threatened to scatter Doma's ashes for harming one of his own.

Yaha arrived just in time to save Shinobu Kocho from Doma’s lethal attack, then checked her injuries and put himself between her and the demon. Doma, enraged at being ignored, prepared to fight Yaha as Yaha drew his attention at last.

• Yaha burst through the room’s wall and melted Doma’s ice spear before it could kill Shinobu Kocho.
• Yaha checked Shinobu Kocho for serious injuries, scolded her, and moved her behind him.
• Doma grew furious as Yaha ignored him and focused entirely on Shinobu Kocho.
• Yaha dismissed Doma as a bug, prompting Doma to flood the room with ice and prepare to attack.
• Yaha faced Doma and declared that he hated anyone who laid hands on someone they should not.

Yaha arrived while Shinobu Kocho was fighting Doma and dismissed her progress before turning his attention to the Upper Rank Two demon. After Yaha destroyed Doma’s strongest ice technique, Doma recoiled in fear as Yaha cornered him and demanded he use every remaining trump card before dying.

• Yaha examined Shinobu Kocho’s poisoned Nichirin Blade and criticized her for using only thirty percent of its poison.
• Shinobu Kocho and Yaha traded barbs while Doma’s freezing aura spread through the room.
• Doma summoned the fifteen-meter Frostbite White Princess and unleashed its extreme cold.
• Yaha drew an inch of his sword and used Dismantle to split the White Princess apart, ending the freezing attack.
• Yaha approached the frightened Doma, called his ice brittle, and ordered him to reveal his remaining trump cards before he died.

Doma unleashed his Water Lily Bodhisattva against Yaha, but Yaha effortlessly protected Shinobu Kocho and erased the ice demon with a slash. As Doma awaited the final blow, Yaha sensed a familiar presence changing amid another battle in the Infinity Castle.

• Doma burned his demon core to summon the eighteen-meter Water Lily Bodhisattva, freezing the lowest labyrinth as Muzan watched through Nakime’s eyes.
• Yaha guided Shinobu Kocho through thousands of ice spikes without letting any touch them, then shattered the Buddha’s descending palm with his fist.
• Yaha unleashed a full-power slash that erased the Water Lily Bodhisattva, leaving Doma kneeling and defeated.
• Yaha prepared to finish Doma, then sensed the wooden-sword-wielding glass doll changing during a distant fight and recognized that it had reached a new threshold.