Vol. 4The Empire’s Expanding War

Tetsuhiro led the Demon Slayer Corps and allied forces through their final battles against Muzan, then expanded the Empire’s campaigns into the Americas before returning to Duel Academy. The group was transported to the Spirit World, where Tetsuhiro carried the unconscious Cobra toward the academy.

  • Urokodaki’s reserve squad confronted Daki and Gyutaro, and Hiruzen’s team arrived to defeat the Upper Rank Six demons and treat the injured.
  • After Yoriichi defeated Tetsuhiro in a spar, the Corps finished a month of training and began an exam that sent shinobi and Demon Slayer teams toward Mount Fujikasane.
  • Tanjiro’s and Hiruzen’s teams defeated the dragons and [Black Luster Soldier], and Tetsuhiro declared the Demon Slayer Corps the exam winners with Murata as the top finisher.
  • Zenitsu confronted Kaigaku, and after Tengen and Gyomei joined the fight, Zenitsu killed him with Thunder Breathing’s Seventh Form: Fire Thunder God.
  • Genya, Sanemi, Muichiro, and their allies fought Kokushibo until Yoriichi appeared, defeated him, and honored Genya’s discovery of the broken Bamboo Flute.
  • Alex’s contacts helped the Empire target officials and criminals, while Florida began a sweeping cleanup and the Florida Four Heavenly Kings drew law-enforcement attention.
  • The Empire defeated the American forces, rescued abused children from Lolita Island, and imposed a new order across the Americas while Yozai managed affairs in Tetsuhiro’s absence.
  • Little Light Man engulfed the island in white light, and the group awoke in the Spirit World beneath three suns and a dark green sky.
Chapters 301–400 Read from ch. 301

Arc 13Swordsmith Village and Final Exam

Tetsuhiro and the Demon Slayer Corps defeated the demons attacking the Swordsmith Village, while Nezuko conquered sunlight and the Corps began intensive training. The end-of-month exam sent the Demon Slayers and shinobi through separate battlefields toward Mount Fujikasane, where more enemies awaited.

  • Urokodaki’s reserve squad confronted Daki and Gyutaro, and Hiruzen’s team arrived to defeat the Upper Rank Six demons and treat the injured.
  • The Corps fought Enmu’s forces and defeated Gyokko and Hantengu, while Muichiro recovered his memories and several Hashira awakened Demon Slayer Marks.
  • Tetsuhiro helped Nezuko conquer sunlight, retrieved Yoriichi’s hidden sword with Tanjiro and Kotetsu, and arranged care and training for the village and Corps.
  • Tetsuhiro strengthened Urokodaki, Kuwajima, and Tiezhen, recruited Tamayo and Yushiro into the Empire, and organized training classes for the Demon Slayers and other recruits.
  • After Yoriichi defeated Tetsuhiro in a spar, the Corps completed a month of training and began an end-of-month exam that sent shinobi and Demon Slayer teams toward Mount Fujikasane.
  • The Demon Slayer team fought through Tetsuhiro’s phantom battlefield, broke the Chaos Shield, and defeated enemies including the Amazoness Swords Woman and Absolute Defense General.
  • The shinobi team defeated the Vampire Progenitor and other vampires, then headed toward Mount Fujikasane as the Demon Slayer group rested before entering its mist-covered slopes.
Chapters 301–325 Summaries Read

Arc 14Infinity Castle Assault

The Demon Slayer Corps and Shinobi World forces defeated the exam’s final dragon and entered Infinity Castle to confront Muzan and the Upper Ranks. They freed Hakuji from Muzan’s control, Zenitsu killed Kaigaku, and Sanemi, Muichiro, and Genya continued fighting Kokushibo.

  • Tanjiro’s and Hiruzen’s teams defeated the dragons and [Black Luster Soldier], then Tetsuhiro declared the Demon Slayer Corps the exam winners and named Murata the top finisher.
  • Li Tetsuhiro sent the teams to Asakusa, where Tanjiro sensed Muzan nearby, while Zenitsu and Li Tetsuhiro saved Jigoro Kuwajima after Kaigaku’s massacre drove him to attempt seppuku.
  • Tobirama used the Dimension Cube to break into Infinity Castle, and Li Tetsuhiro led the forces inside as they split up to face Akaza, Doma, Kokushibo, and Kaigaku.
  • Tanjiro and his allies battled Akaza while Tetsuhiro restored Hakuji’s memories, freeing him from Muzan’s control and persuading him to join the Empire.
  • Shinobu, Kanae, Inosuke, Kanao, and Hakuji fought Doma, and Yoriichi emerged from Tanjiro’s Mindscape to destroy the demon.
  • Zenitsu confronted Kaigaku, and after Tengen and Gyomei joined the fight, Zenitsu killed him with Thunder Breathing’s Seventh Form: Fire Thunder God.
  • Kokushibo fought Sanemi and Muichiro while Genya prepared traps, then Genya’s sniper shot and equipment left Kokushibo blinded as Sanemi and Muichiro attacked.
Chapters 326–350 Summaries Read

Arc 15The Fall of the Beautiful Country

Yoriichi and the allied fighters defeated Muzan, then Tetsuhiro’s Empire expanded its campaign into the Beautiful Country. Alex’s investigation exposed corruption and helped the invasion target gangs and cults, while the Empire’s forces pushed toward the cities.

  • Genya, Sanemi, Muichiro, and their allies fought Kokushibo until Yoriichi appeared, defeated him, and honored Genya’s discovery of the broken Bamboo Flute.
  • Tetsuhiro restrained Muzan and let Yoriichi strike him, then used the Light of Creation God to reduce him to ash before the Corps captured and shrank him.
  • The Empire defeated the remaining demons, rewarded its fighters, and prepared the Demon Slayer Corps and shinobi to occupy Nippon and expand its campaigns.
  • The allied forces conquered Nippon and advanced through neighboring territories as reports about Florida’s suffering led Tetsuhiro to order an investigation and rescue mission.
  • Alex and his companions gathered evidence against powerful families and criminal groups, while Muzan, Hakuji, Gyutaro, and Daki were deployed under strict controls.
  • Murata’s team rescued Alex from the Black Scorpion Gang, and the Empire’s forces attacked gangs and cults as monsters spread through the Beautiful Country.
  • Alex’s contacts helped the Empire target officials and criminals, while Florida began a sweeping cleanup and the notorious Florida Four Heavenly Kings drew law-enforcement attention.
  • The Rockefeller Patriarch supplied military intelligence in exchange for protection, and Empire forces broke through trench defenses as Tengen and Muichiro confronted mustard gas shells.
Chapters 351–375 Summaries Read

Arc 16The Spirit World Beckons

The Empire unified the Americas and exposed the crimes of its enemies before Tetsuhiro returned to Duel Academy, where he freed students from the Light of Ruin and helped Jaden defeat Sartorius and Professor Cobra. The group was transported to the Spirit World, with Tetsuhiro carrying the unconscious Cobra toward the academy as Harpie Lady held Crowler and Napoleon.

  • The Empire defeated the American forces, rescued abused children from Lolita Island, and imposed a new order across the Americas while Yozai managed affairs in Tetsuhiro’s absence.
  • Tetsuhiro returned to Duel Academy, freed Chazz Princeton from the Light of Ruin, and reunited with Yugi, Anzu, Mai, and the other students.
  • Jaden defeated Aster in a duel, and Tetsuhiro absorbed the Light of Ruin from Aster and the other brainwashed students.
  • Tetsuhiro organized a professional dueling tournament to draw out Sartorius, then absorbed the worldwide Light of Ruin while Jaden defeated Sartorius and restored his innocent personality.
  • Professor Cobra used the energy of a giant eye to challenge Jaden, while Tetsuhiro rescued Amon from a hidden chamber and tried to persuade Yubel to send the group onward.
  • Jaden defeated Cobra’s Vennominaga, but a childlike figure called Little Light Man appeared and sent Kaiba and the others flying with its attack.
  • Little Light Man engulfed the island in white light, and the group awoke in the Spirit World beneath three suns and a dark green sky.
  • Tetsuhiro restored Jaden’s stamina, retrieved Amon, and flew toward the academy with the unconscious Cobra, while Jim spotted Harpie Lady carrying Crowler and Napoleon.
Chapters 376–400 Summaries Read
Volume 4 of 6