Chapter Summaries

Sasuke and Shinobu Kocho developed a lightning-activated wisteria poison and built a custom kunai to deliver it past demons’ rapid regeneration. Their test destroyed a preserved piece of Rui, giving Sasuke a weapon that might threaten Muzan.

• Shinobu Kocho examined Sasuke’s blood and agreed to work with him on a way to poison Upper Ranks.
• Sasuke proposed activating the poison with lightning, and Shinobu Kocho devised a heat-triggered compound.
• Sasuke forged hollow, chakra-conductive kunai from Crimson Red Iron Sand while Shinobu Kocho prepared the poison.
• A week later, Sasuke and Shinobu Kocho tested the finished kunai on tissue from Rui.
• Sasuke activated the poison with Chidori Stream, and it rapidly turned the tissue black before it crumbled to powder.

Sasuke spent 10,000 revenge points to upgrade his Sharingan to three tomoe, gaining extraordinary perception and the ability to predict movement. After testing the new power by tracking Shinobu Kocho on patrol, he believed the gap between him and the Upper Ranks had narrowed.

• Sasuke reviewed his remaining revenge points and chose to upgrade his Two-Tomoe Sharingan.
• Sasuke endured the painful transformation as his eyes became a Three-Tomoe Sharingan.
• Sasuke tested his enhanced vision by predicting the movements of leaves, hidden wires, and a passing insect.
• Sasuke watched Shinobu Kocho on patrol and accurately predicted her next movements.
• Sasuke returned his eyes to their ordinary appearance, aware that his new power brought him closer to facing the Upper Ranks.

Kyojuro Rengoku arrived at the Butterfly Mansion and invited Tanjiro, Zenitsu, Inosuke, and Uesugi Sasuke to investigate disappearances aboard the Mugen Train. Sasuke tried to refuse, but the Master ordered him and Kyojuro to work together, leaving Sasuke reluctantly assigned to the mission.

• Kyojuro Rengoku visited the Butterfly Mansion and praised Tanjiro, then greeted the newly appointed Thunder Hashira, Uesugi Sasuke.
• Kyojuro told Tanjiro, Zenitsu, and Inosuke that more than forty people had disappeared aboard the Mugen Train and invited them to join his investigation.
• Kyojuro invited Sasuke to accompany them, eager to see his Kirin and combine their Flame and lightning powers.
• Sasuke began to refuse, but two Kasugai Crows delivered the Master's order for Kyojuro and Sasuke to carry out the mission jointly.
• Sasuke accepted the order reluctantly as Kyojuro welcomed their partnership.

Kyojuro Rengoku led Tanjiro, Zenitsu, Inosuke, and Uesugi Sasuke aboard the train to investigate the disappearances. As the others settled into the journey, Sasuke detected a demon’s sleep-inducing mist spreading through the carriages.

• Kyojuro led the group from the Butterfly Mansion, while Sasuke reflected on Kyojuro’s strength and his own newly unlocked abilities.
• At the station, Inosuke charged the train and knocked himself unconscious by headbutting its side.
• Kyojuro bought tickets and led everyone aboard, where he ate beef hot pot bento while the others bickered and relaxed.
• Sasuke sensed a faint, sweet scent and saw pink mist spreading through the train, identifying it as a demon’s Blood Demon Art.

Sasuke recognized that a demon’s Blood Demon Art had spread through the train and used punched tickets to put passengers to sleep. To find the technique’s source and save his companions, he deliberately entered the dream world, leaving everyone asleep in the carriage.

• Sasuke detected hypnotic pink mist throughout the train and realized it was eroding the passengers’ minds without their awareness.
• A controlled conductor punched Kyojuro Rengoku’s ticket, triggering the mist and making him fall asleep.
• The conductor punched Tanjiro, Inosuke, and Zenitsu’s tickets before Sasuke could warn them, leaving the carriage silent.
• Sasuke resisted the sleepiness until a system quest instructed him to enter the demon’s dream world and locate the genjutsu’s core node.
• Sasuke chose to enter the dream world, handed the conductor his ticket, and fell asleep with the others.

Sasuke broke free of Enmu’s Blood Demon Art by rejecting the false dream of his parents and piercing his own chest with Chidori. Awake on the train, he discovered children approaching the sleeping passengers to destroy their spiritual cores and moved toward them.

• Sasuke recognized the happy scene with his parents as Enmu’s genjutsu and refused to accept it as real.
• Sasuke used Chidori to stab himself, shattering the dream and waking in the train carriage.
• Sasuke saw that Rengoku, Tanjiro, Inosuke, and Zenitsu remained asleep under Enmu’s Blood Demon Art.
• Sasuke spotted children carrying ropes and awls, understood they were sent to destroy the sleepers’ spiritual cores, and silently approached them.

Uesugi Sasuke stopped the children from invading the sleepers’ dreams and cut the ropes binding them. He then used Chidori Stream on Kyojuro Rengoku to try to wake him first.

• Uesugi Sasuke knocked out the girl approaching Kyojuro Rengoku and the boy targeting Tanjiro.
• Sasuke silently incapacitated the other children who had entered the carriage to invade the sleepers’ dreams.
• Sasuke saw the children’s malnourished bodies and severed the ropes around their wrists.
• Sasuke decided to wake Kyojuro first because he was a powerful fighter with great endurance.
• Sasuke placed his hand on Kyojuro’s shoulder and began using Chidori Stream to rouse him.

Sasuke used Chidori Stream to break Kyojuro Rengoku out of the demon’s dream. After learning that the entire train was the demon’s body, Kyojuro vowed to protect everyone while Sasuke searched for and killed the demon’s true body.

• Sasuke pressed his lightning-charged hand to Kyojuro’s shoulder and jolted him awake.
• Kyojuro recognized that a Blood Demon Art had put everyone to sleep and felt ashamed that he had failed to notice it.
• Sasuke explained that the train was the demon’s body and that the sleeping children had been used to enter the passengers’ dreams.
• Kyojuro refused to let Sasuke wake Tanjiro and the others, judging that they would be in unnecessary danger.
• Kyojuro ordered Sasuke to find and slay the demon’s true body, then vowed to protect everyone on the train.

The demon’s flesh erupted throughout the train, threatening nearly two hundred sleeping passengers, and Sasuke helped awaken Tanjiro, Inosuke, and Zenitsu so they could join Nezuko and Kyojuro in defending them. With the others holding the carriages, Sasuke raced toward the locomotive to find the demon’s core.

• The train’s walls became flesh and sent tentacles surging toward the sleeping passengers, and Kyojuro burned back the first wave with Flame Breathing.
• Sasuke woke Tanjiro, Inosuke, and Zenitsu by striking pressure points, then ordered them and Nezuko to protect every passenger alongside Kyojuro.
• Sasuke charged toward the locomotive, where the demon’s true body was located, while Kyojuro took command of the defense.
• Nezuko burned the tentacles with Exploding Blood, and Inosuke tore through the flesh with Beast Breathing as Tanjiro prepared to fight.
• Kyojuro swept through the carriage with Flame Breathing, severing and burning the tentacles to shield the passengers.

Tanjiro, Inosuke, Nezuko, and Kyojuro defended the train’s passengers from Enmu’s flesh while Uesugi Sasuke fought through the demon’s true body. Sasuke reached the locomotive roof and confronted Lower Rank One, Enmu.

• Kyojuro charged into the rear carriages and used Flame Breathing to destroy Enmu’s tentacles and protect the passengers.
• Tanjiro, Inosuke, and Nezuko fought together to hold a safe zone in the first three carriages.
• Uesugi Sasuke cut through the coupling and entered the train’s fleshy interior, where Enmu’s true body had spread.
• Sasuke used Chidori Stream and Fire Release to break through the flesh and locate Enmu’s humanoid avatar.
• Sasuke burst onto the locomotive roof and faced Enmu, who welcomed him as the sole intruder in his dream.

Sasuke resisted Enmu’s Blood Demon Art and used his Sharingan to evade the demon’s hypnotic gaze. Enmu’s attacks failed, and he ended the chapter panicking before Sasuke’s speed and perception.

• Enmu tried to hypnotize Sasuke with the eye on his hand, but Sasuke remained unaffected.
• Enmu opened dozens of eyes across his body to fill the train roof with hypnotic gazes.
• Sasuke revealed his Three-Tomoe Sharingan and walked through the gaps between Enmu’s hypnotic waves.
• Sasuke repeatedly outmaneuvered Enmu, who could neither see him clearly nor land his Blood Demon Art.
• Enmu panicked as he realized Sasuke was a natural predator that fed on Genjutsu.

Sasuke defeated Enmu by trapping him in a Sharingan genjutsu that made him relive repeated deaths at Muzan Kibutsuji’s hands. Enmu’s mind was destroyed, leaving him broken and pleading as Sasuke looked down at him.

• Enmu abandoned his human form and attacked Sasuke with flesh tentacles and bone spikes, but Sasuke easily dodged them.
• Sasuke met the train’s central Hypnotic Eye with his Sharingan and cast Genjutsu: Sharingan.
• In the genjutsu, Enmu repeatedly faced Muzan, who killed him in a cycle of death and resurrection.
• Only a second passed in reality before Enmu’s attacks collapsed and his mind was left shattered.
• Enmu lay twitching and begged Muzan for another chance while Sasuke looked down at him.

Tanjiro and Inosuke fought through Enmu’s flesh-covered train to find the demon’s hidden neck bone, while Nezuko protected the passengers behind them. They exposed the bone and Tanjiro brought down his blade, leaving Enmu’s fate unresolved.

• Tanjiro, Inosuke, Nezuko, and the sleeping Zenitsu struggled to protect passengers from Enmu’s regenerating flesh.
• Kyojuro Rengoku urged Tanjiro and Inosuke to find the demon’s neck bone, revealing that its body stretched across the train.
• Tanjiro smelled Enmu’s strongest presence near the locomotive, and he and Inosuke charged toward the front while Nezuko burned severed limbs to stop them regenerating.
• Inosuke sensed a hard structure beneath the floor and tore open the flesh, exposing Enmu’s enormous neck bone.
• Tanjiro struck the exposed bone with Water Breathing, Tenth Form: Constant Flux.

Tanjiro’s Constant Flux carved a deep crack into Enmu’s spine but failed to sever it, leaving the train’s flesh to erupt into a deadly frenzy. Sasuke destroyed the spinal core with Chidori Sharp Spear, and the Mugen Train derailed toward the mountain forest.

• Tanjiro’s Constant Flux split Enmu’s bone spine but failed to cut through it, and the recoil hurled Tanjiro and Inosuke into a wall.
• Enmu’s train entered a final frenzy as flesh, tentacles, bone spikes, and teeth attacked everyone inside.
• Sasuke used his Sharingan to locate Enmu’s main body core in the Boiler Room and formed a Chidori Sharp Spear.
• Sasuke hurled the spear through the train and struck the crack Tanjiro had made, destroying the spinal core.
• The train’s flesh withered, and the Mugen Train left the tracks and rolled toward the mountain forest.

After the Mugen Train demon died, the train careened off the tracks with its passengers still aboard. Kyojuro Rengoku and Uesugi Sasuke worked together to cushion its crash, and Rengoku announced that all two hundred passengers had survived.

• The Mugen Train's carriages broke free and rolled toward the mountain forest, throwing passengers around inside.
• Kyojuro Rengoku used Flame Breathing to hold the carriages together, block a breach, and protect the passengers.
• Uesugi Sasuke attached Chakra Threads to the train, pulling loose carriages back and controlling their collisions.
• Kyojuro Rengoku burned the frozen ground into a soft landing cushion as Uesugi Sasuke adjusted the train's position.
• The train crashed onto the scorched ground and stopped, and Kyojuro Rengoku declared that all two hundred passengers had survived.

After the train’s passengers survived, Sasuke sensed a powerful enemy approaching. Upper Rank Three arrived at the wreckage, leaving the exhausted slayers facing an overwhelming threat.

• Kyojuro announced that all two hundred passengers had survived, and the survivors erupted in cheers.
• Kyojuro praised Tanjiro, Inosuke, and Sasuke for their actions during the battle.
• Sasuke warned Kyojuro and the others that something a hundred times stronger than Lower Rank One was coming.
• A figure crashed into a crater and revealed himself as Upper Rank Three.
• Upper Rank Three surveyed the battlefield and focused on Kyojuro and Sasuke.

Akaza attacked Tanjiro, but Kyojuro Rengoku intercepted him and refused his offer to become a demon. Uesugi Sasuke studied Akaza’s fighting spirit and movements as Akaza prepared to kill Kyojuro.

• Akaza praised Kyojuro Rengoku’s fighting spirit and dismissed the injured Tanjiro as weak.
• Akaza vanished and attacked Tanjiro, but Kyojuro blocked the blow with Flame Breathing, First Form: Unknowing Fire.
• Akaza invited Kyojuro to become a demon so he could keep growing stronger, and Kyojuro firmly refused.
• Kyojuro declared his duty to slay demons and protect everyone, while Uesugi Sasuke used his Sharingan to study Akaza’s Taijutsu and fighting spirit.
• Akaza accepted Kyojuro’s refusal and said he would kill him instead.

Akaza used Compass Needle to read Kyojuro Rengoku’s fighting spirit and overwhelm his attacks. Watching with his Sharingan, Sasuke worked out how the Blood Demon Art functioned and considered how it might be countered.

• Akaza activated Destructive Death: Compass Needle and charged at Kyojuro Rengoku.
• Kyojuro met Akaza’s attacks with Flame Breathing forms, but Akaza used Disorder to break apart his Flame Tiger and predict his moves.
• Tanjiro watched in terror as Akaza suppressed Kyojuro, while Sasuke remained still and studied the battle.
• Sasuke used his Three-Tomoe Sharingan to see that Compass Needle sensed fighting spirit to anticipate attacks.
• Sasuke wondered what would happen if an attack carried no fighting spirit.

Sasuke suppressed his Fighting Spirit and used kunai to disrupt Akaza’s Compass Needle, creating an opening for Kyojuro Rengoku to wound him. Akaza recognized Sasuke’s tactic and, thrilled by the challenge, unleashed far greater Fighting Spirit.

• Sasuke emptied his mind of revenge and killing, hiding his presence from Akaza’s Compass Needle.
• Sasuke threw a kunai that struck Akaza’s shoulder without triggering the Compass Needle.
• Sasuke’s second kunai grazed Akaza’s cheek, distracting him and making him hesitate.
• Kyojuro Rengoku exploited the opening with Flame Breathing, Fourth Form: Blooming Flame Undulation, badly burning Akaza’s arms.
• Akaza praised Kyojuro and acknowledged Sasuke’s tactic before releasing a surge of Fighting Spirit.

Akaza recovered from Kyojuro Rengoku’s strike and realized Uesugi Sasuke’s kunai and Sharingan had created the opening that let it land. Kyojuro and Sasuke stood together to face him, and Akaza vanished into an attack after challenging them to become demons.

• Akaza healed his exposed-bone wound and recognized that the kunai without fighting spirit had disrupted his Compass Needle, allowing Kyojuro Rengoku to strike him.
• Akaza identified Uesugi Sasuke as the real cause of the opening and turned his anger toward him.
• Kyojuro Rengoku called Akaza’s attention back to himself, and Sasuke silently joined him at his side.
• Akaza rejoiced at facing both Hashira and urged Kyojuro and Sasuke to become demons.
• Kyojuro rejected Akaza’s offer, and Akaza declared he would bury them before vanishing.