Chapter Summaries

Oboro discovered that the Dark Continent’s rulers had kept him from entering their city territories because they feared his soul-devouring power. After a messenger offered him land on the Demon King’s behalf, Oboro rejected the offer and challenged the unseen powers above.

• Oboro’s black mist spread across the Dark Continent, killing soul-bearing creatures and transforming survivors into new lifeforms that gathered around him.
• Oboro realized the city and its guarded door appeared before him but vanished whenever he tried to approach, and he concluded that the rulers were rejecting him.
• A winged fleshy messenger approached Oboro and offered to help him establish his own territory on the Demon King’s behalf.
• Oboro learned that the Demon King had warned other rulers about him and inferred that they feared his growing power.
• Oboro dismissed the offer, shattered the crimson lightning stairway with a blast of soul intent, and received a vast mental response from the sky.

Oboro defeated Canbius, a ruler of the Dark Continent, but his victory drew the attention of the Demon King and two other rulers. As they submitted to a presence in the sky, Oboro realized that beings above ruler level—gods evolved from the continent’s food chain—existed.

• Oboro summoned his vast soul army and confronted the snake-man ruler, who revealed that Oboro’s evolution and intelligence depended on humans.
• Oboro and the snake-man fought with their abilities and colossal forms until Oboro killed him and absorbed his soul, though venom left Oboro badly injured.
• The Demon King arrived and identified the fallen snake-man as Canbius, revealing that it had watched the battle and that Canbius had been used to test Oboro.
• An angel-like creature and a giant bear appeared alongside the Demon King, but all three knelt or bowed rather than attack Oboro.
• Oboro looked toward the sky as it opened and realized that gods existed above the Dark Continent’s rulers.

Oboro met the Tree God, who revealed that his journey had remained within one tree’s territory and that the Dark Continent’s deeper regions were beyond his current ability. The Tree God gave him one year to leave, and Oboro began considering how a wish could send him to another world so he could grow stronger and return.

• Oboro realized that the vast tree overhead dominated the region and that he had never left its territory.
• The Tree God identified Oboro as a visitor from another world and explained that it would expel him because his growth required consuming the ecosystem’s life.
• The Tree God told Oboro that humans had migrated from deeper in the continent and that the dangers there would prevent him from surviving at his current strength.
• The Tree God gave Oboro one year to leave and said it hoped he would return after exploring the Dark Continent.
• After the Tree God and the ruler-level creatures departed, Oboro considered seeking another world where he could grow stronger.
• Oboro thought of Alluka and wondered whether a group of people like her could grant the wish he needed.

Oboro sought a way to travel between worlds and gathered the gaseous lifeforms Ai to use their wish-granting power. After meeting their demands, he wished for his soul to travel freely through space and time, and brilliant white light filled the mountain range.

• Oboro analyzed the risks of crossing into other worlds and concluded that he should start with a lower-level world, reducing his soul's weight to improve his chances.
• Oboro sent his Ghost Mist spirits to find Nanika-like beings and traveled across the continent in a soul state.
• Half a year later, Oboro trapped a large group of gaseous lifeforms Ai in a basin and fused them together with Ghost Mist.
• The Ai demanded Oboro's brain and soul, and Oboro fulfilled both demands by regenerating his head and giving up a fragment of his soul.
• Oboro wished for his soul to travel freely through space and time, and blinding white light flooded the mountain range.

Oboro weakened his soul, created three spiritual guardians, and prepared to cross into another world with his Game Treasury ability. Before departing, he reflected on inheritance and the people he had overlooked, then died with his crossing still uncertain.

• Oboro used his power of rules to strengthen Ai's random world-crossing ability and created spiritual bodies of Meruem, Netero, and Neferpitou to protect the world after he left.
• Oboro spent months stripping away his soul's added power, then integrated the Game Treasury of the Endless Dreamer into his soul as a keepsake for the next world.
• On the final day of his deadline, Oboro asked the system to judge him and learned that he needed to develop a will of inheritance beyond his personal will.
• Oboro recognized the care and affection others had shown him, apologized, and died while holding an empty cigarette pack and his diary.
• The three spiritual bodies left Oboro's remains, which black-winged birds and other small creatures soon found and consumed.

Hisoka reached the Dark Continent’s oasis but died from his wounds after fighting off a swarm of Ghost Bugs. Elsewhere, Don Freecss learned from a demihuman legend that Oboro had arrived a century earlier and defeated a Dominator.

• Hisoka fought a swarm of Ghost Bugs, then collapsed from fatal wounds and died after chewing a piece of gum.
• Menchi had told Hisoka how to reach the oasis, knowing the Dark Continent would likely kill him before he could find Oboro.
• Don Freecss helped demihumans prepare food in their territory and remained fascinated by the Dark Continent’s life and civilizations.
• A demihuman showed Don a carving of a human who had defeated a Dominator a hundred years earlier.
• Don learned that the human had crossed the lake by boat and that the demihumans called him Oboro.

Oboro awakened in the body of a gravely ill samurai in a snowy Japanese estate and discovered that this low-level world severely limited his powers. After restoring his system and accessing its stored items, he planned to seek the blood and Blue Spider Lily to make the most of his time there.

• Oboro woke in a samurai's body and learned from its memories that the former owner was dead.
• Oboro found that his skills remained masterful but his frail body and the world's limits weakened his abilities.
• Oboro told the two maids to call him Oboro instead of Musashiro and asked them to open the doors so he could watch the snow.
• Oboro checked his system, which identified him as a twenty-year-old Honored Samurai with ordinary physical attributes.
• Oboro's system finished updating and opened its inventory, revealing the items he had stored.
• Oboro decided to seek the blood and Blue Spider Lily in the late Edo period, shortly before the Taisho era.

Oboro explored the impoverished entertainment district in the Demon Slayer world, where he encountered the misery of its residents and gave money to a boy named Zekawa. Still dangerously ill, he decided to become a demon to test whether Muzan's blood and will could control him.

• Oboro wandered through the snowy entertainment district, observed its poverty, and saw a father sell his daughter to a brothel keeper.
• Oboro noticed Zekawa following him, asked whether he knew any households named Gyutaro, and gave him a banknote with a warning to protect it.
• Zekawa bowed to Oboro's departing palanquin, then ran as nearby adults approached him.
• Oboro coughed uncontrollably during the ride and recognized that his frail body could not withstand physical training.
• Oboro resolved to become a demon and test whether his weakened soul could resist Muzan's blood and will.

Oboro learned that the Kamado Clan lived in seclusion on Mount Kumotori and decided to visit Kamado Tanpei to experience Sun Breathing. He set out with his attendants, traveling through a Japan marked by poverty and government neglect.

• Daisuke Hayata told Oboro that the Kamado Clan lived on Mount Kumotori and that its head was Kamado Tanpei, who had a wife and one son.
• Hayata reported that old Kamado Shrines connected to fire had once existed, though their origins were lost and the shrines had vanished.
• Hayata told his companion that Oboro belonged to a collateral branch of the shogunate.
• Oboro concluded that the shogunate knew about demons but largely ignored them, while the Ubuyashiki Clan could reach into the authorities.
• Oboro ordered preparations to travel to Mount Kumotori and meet Kamado Tanpei to experience Sun Breathing.
• Oboro and his attendants set out through the snow, and he observed the poverty and disorder that allowed demons to thrive.

Oboro and his party were ambushed on a snowy mountain road by an invisible demon, and Oboro killed it with a sword technique he called Soul Breathing. He left the encounter coughing blood, having confirmed that he could destroy demons without a Nichirin Sword.

• Oboro’s party traveled toward Mount Kumotori at night, and he sensed blood nearby while the samurai failed to notice the danger.
• An invisible demon abducted the two samurai and four palanquin bearers into the forest, leaving Oboro and two maidservants behind.
• The demon appeared and threatened Oboro, who questioned how it had received Muzan’s blood and identified it as a likely Lower Rank’s creation.
• The demon turned invisible and attacked, but Oboro read its movements through the wind and snow and used Soul Breathing, First Form: Yomi Funeral, to sever its head.
• The demon recalled its past as a samurai and thanked Oboro before its body crumbled to ash, while Oboro coughed blood and reflected on the cost of his technique.

Oboro tested how his soul power could kill demons, then traveled to Mount Kumotori to meet Kamado Tanpei. He reached the Kamado home and met the young Tanyilang, while Tanyilang’s father came to the door.

• Oboro killed a demon with an ordinary katana, and the wounded Demon Slayer Corps swordsman Liu Yuan watched in amazement before deciding to inform the Master.
• Oboro avoided Liu Yuan on the journey and arrived in town beneath Mount Kumotori with the two maids.
• Oboro learned Kamado Tanpei had gone to town to sell charcoal and would not return soon, then climbed the snowy mountain with help from an elderly local man.
• Oboro found the Kamado home and introduced himself to the boy, who gave his name as Kamado Tanyilang.
• Tanyilang ran back toward the house after his father opened the door.

Oboro visited Kamado Tanpei to ask to witness the Kamado family’s kagura dance, hoping it might help his failing health. Tanpei invited him to stay the night, and Oboro’s visit left an unusual tension in the household.

• Oboro met Kamado Tanpei and noticed his resemblance to Kamado Tanjuro, including the Hanafuda Earrings but not the forehead scar.
• Oboro asked Tanpei to perform the family’s Fire God kagura dance, but Tanpei declined and explained that he was only a charcoal seller.
• As snow began to fall, Tanpei invited Oboro and his two attendants to stay overnight rather than descend the mountain in the dark.
• Oboro gave Tanjiro a valuable jade ornament as compensation for the family’s hospitality, and Tanpei took his son to prepare dinner.
• The family shared a simple meal and slept in one room, while Tanpei’s wife and Tanjiro sensed the unusual atmosphere between Tanpei and Oboro.

Oboro watched Kamado Tanpei perform the Kagura Dance and demonstrated how Sun Breathing could be controlled rather than accommodated through restrictive movements. After sensing that the world’s power system could grow further, Oboro agreed to nourish its second growth with his inherited will.

• Kamado Tanpei performed the Kagura Dance at dawn while Oboro observed his breathing and energy circulation.
• Oboro identified the dance as movements preserving Sun Breathing passed down through Tanpei’s ancestors, Sumiyoshi Kamado and Suyako.
• Oboro wore Tanpei’s mask and demonstrated Sun Breathing with free, forceful movements, explaining that breathing should adapt to its user rather than the reverse.
• Oboro’s breathing melted the snow around him, and he reflected on Yoriichi Tsugikuni’s extraordinary level of skill.
• Oboro sensed the world as a stunted tree with room to grow and agreed to let it use his inherited will as nourishment for a second growth.

Oboro taught Kamado Tan Ping an improved Sun Breathing method that could spare the Kamado family from its life-shortening effects, and realized he should pass on the civilization and knowledge behind him. After Tan Ping and Kamado Tanjiro bowed to him, Oboro left, planning to settle near Mount Kumotori and search for the Blue Spider Lily.

• Oboro explained that Sun Breathing needed to suit the body and taught Tan Ping how to circulate energy without damaging himself.
• Oboro drew a meridian diagram in the snow and reflected on how his Earth heritage and knowledge had shaped his strength.
• Tan Ping studied Oboro's improved Sun Breathing throughout the morning while Kamado Tanjiro and his family watched.
• Oboro told Kamado Tanjiro to memorize the meridian diagram, and Tan Ping and his son performed the rites of master and disciple before him.
• Oboro declined a formal master-disciple relationship, said he would visit them after buying a residence in town, and praised the woman's wild vegetable soup.
• Oboro left Mount Kumotori with his maids, while Kamado Tanjiro remarked that Oboro smelled nice and Tan Ping reflected that such people still existed.

After Liu Yuan reported that a mysterious swordsman had killed a demon with an ordinary katana, Ubuyashiki Kuno saw new hope in the Demon Slayer Corps’ fight against Muzan Kibutsuji. He summoned the Hashira, who discussed the swordsman and agreed they needed to meet him.

• Liu Yuan’s Kasugai Crow delivered a report saying a mysterious man in a black haori had killed a demon with an ordinary katana.
• Kuno read the report, became overwhelmed with excitement, and told Huina that the swordsman’s power could give the Corps another way to kill demons.
• Kuno summoned every Hashira, and seven gathered at the estate several days later.
• Liu Yuan described how the mysterious man had saved his life, while the Hashira debated whether the weapon or a hidden substance explained the demon’s death.
• The Hashira learned the man had settled in the town beneath Mount Kumotori and agreed to meet him.

Oboro lived near the Kamado family, shared what he knew of their lineage, and planned to consume Blue Spider Lilies so he could become a demon. He returned home to find Ubuyashiki Kuno waiting, and their meeting began with Oboro acknowledging that his appearance might disappoint.

• Oboro visited the Kamado family, accepted their soup and medicine, and taught Tanpei Kamado improved Sun Breathing in return.
• Tanpei told Oboro that only one child in each generation of the Kamado Clan seemed to survive, and Oboro reflected on Muzan's later attack and Tanjiro's fate.
• Tanyoshiro gave Oboro a cane made by Tanpei, and Oboro descended the mountain alone while Tanpei reassured his son that Oboro had already reached home.
• Oboro reasoned that winter Blue Spider Lilies would let him consume enough to become a demon, and he considered the Kamado Clan's inherited power a seed planted for the future.
• Oboro returned to his courtyard and met Ubuyashiki Kuno and a white-haired woman, then told Kuno that seeing him must be disappointing.

Oboro refused Ubuyashiki Kuno’s invitation to join the Demon Slayer Corps, but gave him books on Breathing Techniques to share with its members. Oboro planned to help the Corps gain ground against Muzan without ending the conflict, believing sustained pressure would drive the world’s strength to evolve.

• Kuno and his wife asked Oboro how he killed demons, and he said his power was innate and could not be taught.
• Kuno invited Oboro to join the Demon Slayer Corps and offered to fulfill any condition, but Oboro refused, citing his lack of interest and failing health.
• Oboro tested Kuno by asking whether he could replace him; Kuno explained that the Corps relied on shared purpose and that Oboro would need its members’ approval to become commander.
• Oboro gave Kuno books containing Breathing Techniques and variations, and Kuno left disappointed that he could not recruit him.
• Oboro reflected that he wanted to help the Corps gain ground while preserving pressure from Muzan’s faction so that stronger fighters would emerge.

At the Ubuyashiki estate, the Hashira debated Oboro’s refusal to join the Demon Slayer Corps until they read the Breathing Technique books he had given Kuno. The books astonished them, and Kuno became certain that Muzan’s end was near.

• Kuno told the seven Hashira that Oboro had refused to join the Demon Slayer Corps and had given him several books about Breathing Techniques.
• The Hashira speculated about Oboro’s ancestry and his claimed talent for killing demons, while Kuno kept his extraordinary encounter with Oboro to himself.
• Masayuki urged the others to read the books, and the Hashira examined their detailed diagrams of meridians, acupoints, and qi circulation.
• The Hashira recognized that the books described practical methods for developing inner breath and unlocking the body’s potential, though they struggled to understand their full depth.
• Tenjuro proposed testing the techniques through practice, and Kuno declared that Kibutsuji Muzan’s end was near.

Oboro’s illness worsened as he spent time with the Kamado family, and Tanyilang brought him Blue Spider Lilies before asking about his family. Meanwhile, the Demon Slayer Corps began applying Oboro’s Breathing techniques in secret, preparing a counterattack unknown to Muzan.

• Oboro’s health declined despite the Kamado family’s care, while Kamado Tanpei’s condition improved and Tanyilang began learning Breathing from his father.
• Tanyilang brought Oboro Blue Spider Lilies, which quickly froze and crumbled after being picked.
• Tanyilang asked about Oboro’s family, and Oboro said he had once had a family elsewhere and hoped to return to them.
• Oboro wondered whether the Kamado generation would be enough to carry on Sun Breathing after recalling Tanpei performing the Kagura Dance.
• The Demon Slayer Corps incorporated Oboro’s Breath Control techniques into its training, and Ubuyashiki Kuno gathered the swordsmen for secret intensive training.
• Muzan and his demons remained unaware as the Demon Slayer Corps prepared to counterattack.

Oboro left the Kamado family a black haori and traveled to Qinglin Town to investigate disappearances linked to a powerful demon. He uncovered a village conspiracy and pretended to be helpless as the innkeeper turned on him.

• Oboro left the mountain without saying goodbye, and a servant delivered Kamado Tanjiro the black haori he had left for him.
• Oboro used Magistrate Office reports to track a trail of disappearances to Qinglin Town and arrived with samurai and two maids.
• Oboro sensed the smell of blood and found the village eerily empty, then entered a tavern after an old innkeeper claimed an illness had driven away most residents.
• Oboro suspected the villagers were gathered at a shrine where a demon was hiding, and the innkeeper drugged the samurai's liquor until they collapsed.
• The innkeeper revealed a dagger and threatened Oboro and the maids, while Oboro pretended to fear him and claimed he was from the shogunate.