Chapter Summaries

Xia Xi unlocked Mimicry: Transparent World during his fight with Fūma Ichimei, then knocked the old man out with a punch and reunited Hinatsuru with Tengen Uzuike. He returned to Uzuike and the others, boasting about his new skill.

• Xia Xi entered a heightened state of perception and unlocked Mimicry: Transparent World while fighting Fūma Ichimei.
• Fūma Ichimei recognized Xia Xi's unusual breathing and wondered whether he was a master swordsman who used Sun Breathing.
• Xia Xi sheathed his sword, struck Fūma Ichimei with Iron Fist Severing Wind, and knocked him unconscious.
• Xia Xi found Hinatsuru hiding nearby and took her to Tengen Uzuike, whose battle had ended.
• Xia Xi rejoined Uzuike, Iguro, and the others, then bragged that his new skill was better than Uzuike's technique.

Xia Xi and Obanai helped Tengen Uzui defeat the Uzui Family’s resistance, and Tengen decided to become the village’s Kage so his wives could lose their rogue-ninja status. A week later the family purge was complete, and Chiyo and Fūma Ichimei returned with the heads of clansmen who had fled.

• Xia Xi learned that Tengen had spared his father, Uzui Seshū, who escaped after attacking Suma, and gave Tengen ointment for his wounds.
• Gen'nosuke urged Tengen to become Kage, and Tengen agreed to recover before heading with Xia Xi and Obanai to the Uzui Family Residence.
• Tengen said he would remove the rogue-ninja label from himself, Hinatsuru, Makio, and Suma, while leaving the village’s daily affairs to Gen'nosuke.
• Over the following week, Tengen and Gen'nosuke consolidated the Uzui Family, with Gen'nosuke crushing the hardliners who resisted.
• Chiyo and Fūma Ichimei returned in under three days with the heads of clansmen who had fled the Sound ninja village.

Tanezaki Chiyo, Fūma Ichimei, and other Ninja families agreed to cooperate with Xia Xi and the Demon Slayer Corps. Persimmon finalized the Corps’ agreement with the Ninja Village, then presented a separate agreement for Xia Xi’s personal territory.

• Tanezaki Chiyo and Fūma Ichimei brought heads as gifts and explained why they wanted to establish ties with Xia Xi and the Demon Slayer Corps.
• Other Ninja families, including those of Makio and Suma, also expressed willingness to cooperate with the Corps.
• Xia Xi studied a Ninja Beast training manual and a Disguise Technique scroll, then hinted to Obanai that he had a surprise for him.
• Xia Xi brought Persimmon from Yokohama to negotiate with the Ninja families, and her Breathing Style made the gathered experts realize they had underestimated her.
• Persimmon drafted and finalized an agreement for the Corps to fund the Ninja Village in exchange for training, manpower, intelligence, Ninja Beasts, and other support.
• Persimmon had the representatives sign the Corps agreement, then introduced a separate cooperation agreement with Xia Xi’s personal territory.

Xia Xi arranged for the Sound Ninja Village to train Demon Slayer Corps members and supply limited night-vision medicines, then brought Tengen Uzui and Obanai Iguro to Igarashi’s residence. He began planning a new intelligence department based on the ninjas’ professional system, leaving the Corps poised for its next reform.

• Chiyo Tanezaki agreed to provide sparring partners, nighttime combat training, and limited eyesight-improving medicines under conditions, while Fuma Ichimei volunteered to join the first group and bring White Fang.
• Xia Xi accepted the Sound Ninja Village’s terms and suggested that White Fang might learn a Breathing Style.
• Xia Xi took Tengen Uzui and Obanai Iguro to Igarashi’s residence, where he discussed the Demon Slayer Corps’ sixth reform phase with them.
• Xia Xi explained to Persimmon that the Corps relied on passive reports, untrained helpers, and Kasugai Crows to locate demons.
• Xia Xi planned to build a dedicated intelligence department using the Sound Ninja Village’s expertise in reconnaissance, tracking, communication, and analysis.

Xia Xi proposed creating an Intelligence Department within the Demon Slayer Corps, using trained Kakushi, retired Swordsmen, Ninja, and Ninja Beasts to investigate demons and strengthen communications. He outlined a wireless network of branch outposts, leaving the plan at the stage of a proposal for Boss Ubuyashiki.

• Xia Xi sent Boss Ubuyashiki a proposal to split the Kakushi into an Intelligence Department and a Logistics Department, with distinct duties.
• Xia Xi explained that Intelligence Operatives would work alongside outsourced Ninja and Ninja Beasts, while Tengen demonstrated a trained eagle by having it carry Kuang Jin away.
• Xia Xi described how animal partners and Ninja could monitor demons and gather intelligence in cities.
• Xia Xi proposed using Wisteria Houses, Kakushi residences, temples, and shrines as branch outposts equipped with radios to create a wireless communications network across the Far East.

Xia Xi and Igarashi planned a radio network to improve the Demon Slayer Corps’ intelligence and response times, and Ubuyashiki approved the proposal. After weeks of preparation, the first equipment arrived in Yokohama, where the Kakushi began learning to operate it.

• Igarashi explained that Spark-Gap Radios could form a network across Honshu, while Xia Xi outlined how the Corps would use stations to transmit intelligence and direct demon-slaying teams.
• Kazami questioned the cost, but Xia Xi and Igarashi believed Ubuyashiki would support the plan; Kuang Jin returned after the discussion had ended.
• Ubuyashiki approved Xia Xi’s proposal the next day, and Xia Xi, Igarashi, and Tengen Uzui spent the following weeks organizing its implementation.
• Tengen Uzui mastered Igarashi’s Transparent World technique only while in his Score state, and Xia Xi modified his haori; Persimmon also got a new uniform.
• The Ubuyashiki family secured the radio equipment, which arrived in Yokohama about three weeks later, and Arashi Jūgo began training the Kakushi to use the machines and Morse Code.

Xia Xi organized the Demon Slayer Corps’ new Intelligence Department, establishing radio networks, encrypted codebooks, ninja training, and a three-tier promotion system. After assigning most ninjas to fieldwork, he prepared a separate mission for the remaining jonin in police headquarters and stations across the Far East.

• The Ubuyashiki Family and Xia Xi began planning radio stations in nearly thirty key cities, with trained operators, remote equipment buildings, and monthly codebook changes.
• Igarashi Usen traveled around the country to oversee construction, while Yukishiro Seiko coordinated the project from the rear.
• Tengen Uzui brought 130 ninjas and several ninja beasts from the ninja village to train and assist the Corps’ intelligence personnel.
• Xia Xi sent two-thirds of the ninjas to coordinate with local Kakushi and arranged intensive training for the prospective intelligence agents.
• Xia Xi created regular, senior, and special-grade intelligence agent ranks based on professional skills, field experience, and mission safety.
• Xia Xi kept the remaining jonin behind and planned to assign them to police headquarters and stations across the Far East.

Xia Xi organized the Demon Slayer Corps’ intelligence work around police case files and developed a detector that estimated a demon’s strength from its blood. The detector proved useful enough that Kazami asked Xia Xi to make more.

• Ubuyashiki approved Xia Xi’s plan to have ninjas discreetly copy suspicious police case files, warning them to proceed with great caution.
• Ten Jonin reviewed unsolved cases around Kyoto and transcribed suspicious incidents, which Kakushi and swordsmen screened for demon connections.
• Xia Xi assigned intelligence operatives to rank suspected demon incidents by location, timing, victims, and threat level, with ninjas and nearby high-ranking swordsmen investigating the most dangerous cases.
• Xia Xi showed Yan Zi, Shinazugawa, Kuang Jin, and Persimmon a device that used demon samples and crimson red iron sand to indicate a demon’s strength by color.
• Kazami asked Xia Xi to make more combat power detectors, and Xia Xi said he could produce thirty or forty in about a month.

Xia Xi advanced the Yoriichi puppet series and deployed several Combat Puppets to support Demon Slayer Corps branches. As his junior brothers left Yokohama for missions and Final Selection, he reviewed their progress and reflected on how far Sabito and Giyu had come.

• Xia Xi reached LV.3 in Puppet Mechanism Technique, improved his Combat Puppets, and sealed away their awkward Combination function.
• Xia Xi sent One Six Stone Type and One Six Wind Type to new branches, while keeping the strongest One Six Sun Type at the Igarashi Family's home to protect his Senior Brother.
• Xia Xi's junior brothers departed Yokohama: Kuang Jin took on high-level missions, while Hajimi and Street Girl traveled to Lake Ashi for Final Selection.
• Xia Xi worried that Hajimi's temper and Giyu Tomioka's blunt remarks might cause trouble at the Selection, where Giyu was Chief Examiner and Murata was an Assistant Examiner.
• Xia Xi checked the swordsmen's records and saw that Sabito had reached a power level of 309, while Giyu Tomioka had reached 279 and was nearing the Nine Hashira.

Kagaya Ubuyashiki learned that Kyojuro Rengoku had slain every demon during the Mount Fujikasane Final Selection, allowing all seventeen candidates to pass without being tested. After Kyojuro reunited with examiner Dōjima Kazuma, Obanai Iguro received a letter from Xia Xi and set off to visit him.

• Amane told Kagaya Ubuyashiki that all seventeen candidates passed the Mount Fujikasane selection because Kyojuro Rengoku had killed every demon within two days.
• Kagaya instructed Dōjima Kazuma and the other examiners to assess the candidates individually on their abilities and convictions instead of sending them to fight demons again.
• Kyojuro emerged from the wisteria forest with the other candidates and told Dōjima he had slain the demons to help them, as Xia Xi had taught him.
• Kyojuro recalled his former training companions Shinobu Kocho and Iguro while praising Dōjima's Breathing Style.
• Obanai Iguro received a message from Xia Xi summoning him to Yokohama and told a fellow swordsman to inform the Sound Hashira that his next mission might require him.

Obanai arrived at the Igarashi residence and learned that Xia Xi had called him there to treat the scar across his mouth. Xia Xi anesthetized him and prepared to begin the procedure.

• Obanai reached the Igarashi residence and was escorted to the back courtyard, where he mistook Xia Xi’s disguised appearance for that of a stranger.
• Xia Xi revealed his identity, and Obanai asked why he had been summoned.
• Xia Xi told Obanai he had gathered what he needed to heal the scar on his face and help him stop wearing a mask.
• Obanai agreed eagerly to the treatment, and Xia Xi led him to a prepared medical room.
• Xia Xi used a wisteria-scented anesthetic to put Obanai to sleep before beginning the procedure.

Xia Xi successfully operated on Obanai Iguro to repair his mouth and scars, then received news that Sabito might become the next Hashira. The chapter ended with Xia Xi investigating a report about a mysterious man in Okutama who wore earrings like those on his combat puppets and may have known Breathing.

• Xia Xi used his medical skills and disguise technique to operate on Obanai, whose mouth had healed badly after a severe injury.
• Xia Xi told Obanai the surgery had succeeded, explained his recovery and scar-treatment schedule, and reassured him that he would no longer need to wear a mask.
• Several weeks later, Xia Xi continued checking Obanai's recovery while the Intelligence Department expanded its operations under Igarashi's leadership.
• Kagaya Ubuyashiki wrote to Xia Xi about Sabito's proposed promotion after Sabito killed the Lower Rank demon Kamanue in Hyogo Prefecture.
• Gao Qian delivered a report that a middle-aged man in the Okutama mountains wore earrings matching Xia Xi's combat puppets and might have mastered a Breathing technique.

Xia Xi investigated Tanjuro Kamado’s earrings and unusual Breathing Style, then decided to travel to Okutama Town instead of attending the Hashira Meeting. Tanjuro noticed that powerful animals and strangers were watching him, and an unfamiliar boy confronted him as he headed home.

• Xia Xi learned that Tanjuro wore Nichirin Flower Earrings and was rumored to use a Breathing Style similar to Dawn Breathing.
• Xia Xi declined the Hashira Meeting, endorsed Sabito’s promotion, and asked other Hashira to support the young swordsman.
• Xia Xi decided to investigate Tanjuro in Okutama Town and began preparing to travel there.
• Tanjuro continued working to support his family while noticing unusually powerful animals and unfamiliar people observing him.
• Tanjuro saw the strangers disappear as he left the village, but an unfamiliar boy blocked his path and reacted with surprise.

Xia Xi encountered Tanjuro Kamado and discovered that he practiced an incomplete form of Sun Breathing and possessed the Transparent World and an inactive Demon Slayer Mark. After rejecting the chance to acquire an acquired Demon Slayer Mark with severe lifespan costs, Xia Xi befriended Tanjuro and was invited to his home to discuss Hinokami Kagura.

• Tanjuro stopped when Xia Xi appeared on the mountain path and recognized that Xia Xi used a breathing rhythm resembling Hinokami Kagura and could see the Transparent World.
• Xia Xi examined Tanjuro's abilities and received a prompt offering him the acquired Demon Slayer Mark, but he rejected it after reading that it greatly shortened lifespan.
• Xia Xi questioned Tanjuro about Hinokami Kagura, and Tanjuro explained that his family had passed down the dance for generations.
• Tanjuro offered to discuss the dance the next day because he needed to return home to his wife and children.
• Xia Xi offered to buy Tanjuro's charcoal and proposed sharing a meal, and Tanjuro welcomed him home.

Xia Xi accompanied Tanjuro Kamado home, questioned him about his family’s history and earrings, and met the Kamado family. The chapter ended when Xia Xi saw Tanjiro’s status panel and discovered the boy was a prodigy with incomplete Sun Breathing and an inactive mark.

• Xia Xi asked Tanjuro about Yoriichi Tsugikuni, Sun Breathing, and the Kamado family, but Tanjuro knew no such history and said his earrings had been passed down and repeatedly repaired.
• Tanjuro greeted Saburō, who gave him rice balls and warned him to get home before demons came out; Tanjuro left charcoal outside Saburō’s door.
• Tanjuro brought Xia Xi to his home, introduced him to Kie and the children, and Xia Xi offered to cook dinner.
• Tanjiro came out carrying a baby, and Xia Xi saw a panel identifying him as a born prodigy with incomplete Sun Breathing and an inactive acquired mark.

Xia Xi visited the Kamado family, impressed Tanjiro and Nezuko with his cooking, and shared a private drink with Tanjuro. He ended the night by telling Tanjuro that he would die soon.

• Tanjiro met Xia Xi and sensed his unusual but pure scent, while Xia Xi praised Tanjiro and asked him to call him Big Brother.
• Xia Xi prepared an extravagant beef meal, delighting the Kamado family with his cooking.
• After the family ate, Xia Xi and Tanjuro went outside for a private conversation and shared marble soda.
• Xia Xi seriously told Tanjuro that he was going to die soon.

Xia Xi told Tanjuro that his illness was severe and that he might not survive the next winter, then revealed he could treat him. Tanjuro learned he might live at least another ten years and asked what the treatment would cost.

• Xia Xi told Tanjuro that his body was failing and estimated he had less than a ten percent chance of surviving the next winter.
• Tanjuro accepted that he might die soon and considered how to provide for Kie and the children and pass on the Hinokami Kagura.
• Xia Xi explained that Tanjuro's illness stemmed from strain, malnutrition, exhaustion, pneumoconiosis, and kidney deficiency.
• Xia Xi said he could treat Tanjuro and give him at least another ten years of life.
• Tanjuro asked Xia Xi what price he would have to pay for treatment.

Xia Xi offered to cure Tanjuro’s illnesses in exchange for joining the Demon Slayer Corps, and persuaded him by promising support and opportunities for his family. Tanjuro agreed, and Xia Xi reassured him that he could still become a demon-slaying warrior.

• Tanjuro asked Xia Xi why he would treat him when the Kamado family had nothing valuable to offer in return.
• Xia Xi offered to cure Tanjuro if he joined the Demon Slayer Corps and became one of the Nine Hashira, then explained the threat posed by demons.
• Tanjuro initially refused because his wife and children still needed him, but Xia Xi said he could bring his family and promised them support, schooling, and medical care.
• Xia Xi cited Tanjuro’s Demon Slayer Mark, Transparent World, and Hinokami Kagura as proof of his talent, and Tanjuro agreed to join.
• Xia Xi warned Tanjuro that Muzan Kibutsuji had hunted users of Sun Breathing for centuries and encouraged him to train his family.
• Tanjuro doubted he could fight demons given his age and poor health, and Xia Xi assured him that he could and that Xia Xi was a capable teacher.

Tanjuro demonstrated the Kamado family’s Hinokami Kagura, and Xia Xi recognized it as a concealed form of Sun Breathing passed down from Yoriichi Tsugikuni. After a ninja delivered the requested medical supplies, Xia Xi prepared to begin Tanjuro’s treatment.

• Tanjuro performed the Hinokami Kagura for Xia Xi despite his frail condition, revealing its hidden sword forms and Sun Breathing techniques.
• Xia Xi confirmed that the dance preserved Yoriichi’s Sun Breathing, though generations of transmission had introduced slight differences.
• Tanjuro asked about Yoriichi, and Xia Xi explained that the legendary swordsman had defeated the Final Boss and was stronger than Xia Xi currently was.
• A masked ninja emerged from the woods and told Xia Xi that the requested medicinal ingredients and medical instruments had arrived.
• Xia Xi told Tanjuro they would begin the first stage of his treatment after lunch.

Kie Kamado feared that her gravely ill husband, Tanjuro, would soon die, but Kurumaji arrived and began treating him. As Tanjuro endured the first treatment, Kurumaji told him to rest, avoid strenuous work and Kagura, and abstain from marital relations for now.

• Kie secretly pawned her dowry and worked harder to care for Tanjuro and their children, but his health continued to worsen through the winter.
• Kurumaji returned with Tanjuro, and Kie noticed that her premonition of her husband's imminent death had vanished.
• Kurumaji reassured Kie that Tanjuro was not seriously ill and said he would treat his chronic lung trouble.
• Kurumaji instructed Tanjuro to rest, stop heavy work and Kagura, and avoid sex while recovering from kidney deficiency.
• Kurumaji began a conservative treatment using acupuncture, ointment, medicines, and massage as Kie waited anxiously with the children outside.
• Tanjiro reassured his younger siblings and noticed that Tanjuro's scent seemed to be improving slightly.