Chapter Summaries

After a year of training, Mu Yu reflected on his growth and spent the night telling Kuina a story. The next morning, Kuina mistook her first period for something Mu Yu had done, and Mu Yu realized he was losing his hair.

• Mu Yu reviewed his abilities and worried about the world mission’s rising difficulty despite his rapid progress.
• Kuina visited Mu Yu at night and asked him to tell a story, so he told her about Elsa and Anna.
• Kuina fell asleep during the story, and Mu Yu carried her to bed before falling asleep himself.
• Kuina woke Mu Yu the next morning, accused him of being shameless, and ran off without letting him explain.
• Mu Yu realized Kuina had gotten her period and considered asking Aunt Sharon to help explain it to her.
• Mu Yu tugged at his hair and found a handful in his hand, fearing that he was going bald.

Mu Yu went to the market to buy food for Kuina while Koshiro left to appraise a piece of Meteorite Iron. Terukawa attacked and wrecked the Isshin Dojo in Koshiro’s absence, and Kuina faced him while hoping Mu Yu would return in time.

• Aunt Sharon advised Mu Yu to show Kuina concern by bringing her food, and Kuina ran off when he tried to greet her.
• Koshiro told Mu Yu he was visiting a friend to appraise Meteorite Iron and left Mu Yu in charge of the dojo.
• Mu Yu went to the Shimotsuki Village market, where villagers welcomed him and sold him goods cheaply.
• Terukawa arrived at the Isshin Dojo, sent Instructor Sosuke flying, struck Kojiro, and ordered his men to destroy the dojo and beat its students.
• Kuina stopped one of Terukawa’s men from taking down the dojo sign, recognized Terukawa, and resolved to stall until Mu Yu returned.

Kuina fought Terukawa’s subordinate to protect Isshin Dojo’s signboard, but Terukawa broke his promise, destroyed it, and abducted her to force Master Koshiro to accept a challenge. The chapter ended as a figure raced back to the dojo ten minutes after Kuina was taken.

• Terukawa offered to spare Isshin Dojo’s signboard if Kuina defeated one of his subordinates, and Kuina accepted.
• Kuina attacked the bald pirate with her Bamboo Sword, but he overpowered and badly injured her.
• Kuina remembered Mu Yu’s accidental lesson and struck the bald pirate in the crotch, then knocked him unconscious with repeated blows.
• Kuina declared that she had won, but Terukawa secretly took the signboard and shattered it into four pieces.
• Terukawa said he would take Kuina to make Master Koshiro accept a challenge, and abducted her.
• Ten minutes later, a figure raced back to the dojo.

After Terukawa wrecked the dojo and took Kuina, Mu Yu treated the injured and learned what had happened from Instructor Sosuke. Mu Yu and Zoro set out to rescue Kuina, with Sosuke’s description of Terukawa’s altered appearance hinting that he might have a Devil Fruit.

• Mu Yu found the dojo ruined and its people injured, then used Blood Medicine and bandages to treat them.
• Zoro returned from training and, after Instructor Sosuke woke, learned that Terukawa had attacked the dojo and taken Kuina.
• Mu Yu decided to go after Terukawa, but Zoro insisted on joining him and went to retrieve his real swords.
• Instructor Sosuke told Mu Yu that Terukawa’s appearance and temperament had changed so much that he seemed like another person, prompting Mu Yu to suspect a Devil Fruit.
• Mu Yu retrieved Wado Ichimonji from Kuina’s room, and he and Zoro left to find her.

Mu Yu and Zoro went to Crescent Bay to find the Terukawa Pirates and rescue Kuina, but the cautious crew spotted Mu Yu before they could sneak in. Mu Yu killed Heng Er and defeated the massive officer Brecci, while Zoro’s attempt to reach Kuina remained unresolved.

• Mu Yu told Zoro that the pirates were likely hiding at Crescent Bay and planned to draw their attention while Zoro rescued Kuina.
• Zoro ran in the wrong direction, and Mu Yu corrected him before they reached Crescent Bay and watched the pirate ship from behind a boulder.
• Mu Yu drew the sentries’ attention, then killed Heng Er when the pirate attacked him.
• Terukawa ordered Brecci to confront Mu Yu, and Brecci’s hardened skin repelled Mu Yu’s first sword strike.
• Mu Yu used a high-speed sword draw to slash Brecci open, leaving the pirates stunned.

Mu Yu rescued Kuina and confronted Terukawa, the pirate captain, whose powerful sword strikes tested the results of Mu Yu’s training. The battle continued with Mu Yu standing firm against Terukawa’s increasingly fierce attacks.

• Kuina woke and saw Mu Yu defeat Brecci with one strike, while Zoro watched from the shadows and resolved to train harder.
• Terukawa jumped down from the pirate ship and attacked Mu Yu with a powerful sword slash.
• Mu Yu blocked Terukawa’s strike, shocking the pirates and earning Terukawa’s excited respect for his talent.
• Terukawa attacked repeatedly, and Mu Yu used his Thousand Piles of Snow technique to meet each blow without retreating.

Mu Yu traded blows and words with Terukawa, rejecting his offer to become vice-captain and exposing the difference in their beliefs and training. As Terukawa abandoned the argument, he grew to roughly 2.5 meters and erupted in crimson flames, forcing Mu Yu to prepare for the fight to continue.

• Mu Yu blocked Terukawa's slash without stepping back, and Terukawa praised his strength and asked him to join the pirate crew as vice-captain.
• Mu Yu rejected Terukawa's offer and condemned him for betraying his master, bullying the weak, and breaking his word.
• Terukawa blamed Koshiro for ending his training after three years, but Mu Yu revealed that Koshiro had taught him for only one year.
• Terukawa and the pirates were stunned by Mu Yu's brief training, while Terukawa's confidence gave way to jealousy.
• Terukawa dismissed Mu Yu's talk of character and justice, then grew taller as crimson flames ignited around him.

Mu Yu fought Terukawa, whose Asura-form Devil Fruit and Six-Sword Style had made him confident he could become Pirate King. Mu Yu awakened Observation Haki and used Miyamoto Musashi’s swordsmanship to overcome Terukawa, while Zoro reached the bound Kuina.

• Terukawa transformed into his three-headed, six-armed Asura form and revealed that he had stolen a relic after his master entrusted it to him.
• Mu Yu heard the breathing of all things, evaded Terukawa’s Six-Sword Style: Net, and realized he had awakened Observation Haki.
• Mu Yu summoned Wado Ichimonji and used Miyamoto Musashi’s Two-Sword Style to block Terukawa’s attacks.
• Terukawa unleashed Six-Sword Style: Great Avalanche, but Mu Yu’s Void made the attack and the falling seawater pass through him harmlessly.
• Kuina watched Mu Yu’s victory in shock, then saw Zoro arrive and felt moved that he had come for her.

Zoro freed Kuina and gave her Blood Medicine and a sword, but Terukawa ordered his pirates to kill them before they could escape. As Zoro and Kuina fought off the crew, Mu Yu unleashed the full Eyes of the Thiên Nhãn and used its power to seek a way to kill Terukawa.

• Zoro cut Kuina free, gave her Mu Yu's Blood Medicine and one of his swords, and planned to escape with her.
• Terukawa spotted Zoro and Kuina and promised his pirates an officer's rank to whoever killed them.
• Zoro and Kuina stood back-to-back and fought the pirates surrounding them.
• Mu Yu grew furious as he saw Zoro and Kuina in danger, then vowed to kill Terukawa even at the cost of his life.
• Mu Yu opened the Eyes of the Thiên Nhãn and searched its causal lines for the possibility of cutting off Terukawa's head.

Mu Yu used the One-Sword Style Secret Technique: Fudo Myoo to behead Terukawa and drive the pirate crew into the sea. Zoro and Kuina watched in shock as the remaining pirates fled.

• Mu Yu's Causal Magic Eyes made Terukawa feel certain that he was about to be beheaded, and Terukawa begged for his life.
• Mu Yu manifested Fudo Myoo and beheaded Terukawa with a single sword strike.
• Terukawa recognized the technique as the kind of swordsmanship Koshiro had once described before he died.
• Mu Yu showed Terukawa an apple marked with Karakusa-like patterns, then ordered the pirates to get lost.
• The pirates jumped into the sea, while Zoro and Kuina stared at Mu Yu in amazement.

After the battle against the Terukawa Pirates, Mu Yu collected a huge bounty of rewards and spent his Energy Points on new abilities and upgrades. He gained gravity control without Devil Fruit weaknesses and ended with greatly increased skills and powers.

• The system reported Mu Yu’s rewards for completing quests and defeating the Terukawa Pirates, including Soru, a Three-Color Haki tree seed, and a Press-Press Fruit tree seed.
• Mu Yu asked whether planting the Press-Press Fruit tree would give him Devil Fruit weaknesses, and the system explained that it would not.
• Mu Yu planted the Press-Press Fruit tree and gained the ability to control gravity.
• Mu Yu spent all his Energy Points and reached Physique Level 20, Swordsmanship Level 16, Gravity Level 16, and Three-Color Haki Level 16.

After Mu Yu defeated the Terukawa Pirates, Shimotsuki Village celebrated him as a hero while he recovered at Isshin Dojo. Once awake, he proposed using the pirates’ treasure to host a village banquet and gave Kuina a strange-patterned apple.

• Uncle Rein spread tales of Mu Yu’s victory, and the villagers’ stories made him Shimotsuki Village’s most famous person.
• Villagers brought food and gifts to Isshin Dojo while Kuina reassured them that Mu Yu was only exhausted.
• Mu Yu woke and told Kuina to accept the villagers’ kindness by holding a banquet for everyone.
• Mu Yu said the treasure from the Terukawa Pirates could pay for the feast and explained that a Marine Vice Admiral had offered him a place in the Marines.
• Mu Yu gave Kuina a strange-patterned apple, and she eagerly accepted it.

Kuina chose to return the Asura Fruit to her father rather than eat it, renewing her determination to pursue swordsmanship at her own pace and making a promise with Mu Yu. After learning that the world’s difficulty had increased, Mu Yu went to teach Zoro advanced Iaido techniques before leaving the One Piece World.

• Mu Yu explained that the Asura Fruit would make a woman beautiful, and Kuina was eager to eat it until she remembered her father’s regret over losing the fruit.
• Kuina decided to give the fruit to her father, trusting her own talent and resolving to pursue her goal without rushing.
• Kuina and Mu Yu clasped hands and promised not to fall behind each other.
• The system told Mu Yu that the world’s difficulty had increased by five percent, and he considered leaving the One Piece World.
• Mu Yu found Zoro training and offered to teach him Iaido enhancements and the secret art of three slashes in one second.

After a village banquet, Kuina ate the Asura Fruit and gained Asura Power, transforming in appearance and strength. The system warned Mu Yu that the world’s difficulty had reached 40% and advised him to leave, while Koshiro asked him to stay behind.

• Mu Yu enjoyed the village feast with Koshiro, Kuina, Zoro, and the villagers before the celebration ended and everyone returned to the Isshin Dojo.
• Sun Liu gave Kuina the Asura Fruit, and Koshiro approved her eating it.
• Kuina ate the fruit, gained Asura Power, and underwent a striking transformation.
• The system informed Mu Yu that the Plot Twist Degree had increased by 5%, the world’s difficulty had reached 40%, and he should leave as soon as possible.
• Koshiro sent everyone to sleep but asked Mu Yu to stay behind.

Koshiro thanked Mu Yu for saving Kuina and protecting the dojo, then passed down the Menkyo Kaiden calligraphy as recognition of his mastery of Isshin Dojo’s techniques. He explained the four realms of swordsmanship, and the chapter ended with him leading Mu Yu away to show him something more.

• Koshiro thanked Mu Yu for saving Kuina and healing her doubts about her strength, and praised him for protecting the dojo.
• Koshiro gave Mu Yu the Menkyo Kaiden calligraphy inherited from his own master, granting him the right to pass on Isshin Dojo’s techniques.
• Koshiro explained that swordsmanship had four realms and judged Mu Yu’s current skill to be average among the world’s swordsmen.
• Koshiro demonstrated Armament Haki on a branch, but Mu Yu immediately coated his fist in Haki and revealed he had also learned Observation and Conqueror’s Haki through his Devil Fruit ability.
• Koshiro warned Mu Yu not to depend too much on his Devil Fruit, described forging a permanent black blade as the fourth realm, and told him to follow.

Koshiro gave Mu Yu a Great Grade Sword named Myōō and approved his wish to set sail. After a week of farewells and preparations from Kuina, Zoro, the dojo children, and the villagers, Mu Yu's departure day arrived.

• Koshiro gifted Mu Yu a Great Grade Sword forged with Sun Liu, taught him to keep a Buddha's heart, and let him name it Myōō.
• Mu Yu told Koshiro he wanted to see the world, and Koshiro approved his plan to set sail.
• Kuina struggled with Mu Yu's departure, while Zoro vowed to challenge him for the title of World's Greatest Swordsman.
• The dojo children and villagers helped Mu Yu prepare, providing supplies, repairing his boat, and teaching him navigation.
• Mu Yu's day of setting sail arrived.

Mu Yu said goodbye to Shimotsuki Village as he prepared to sail, promising to make his name known across the world. As his boat left shore, he drove off a Sea King with Conqueror’s Haki, becoming a legend in the villagers’ eyes.

• Mu Yu bid farewell to the villagers and Isshin Dojo disciples, then promised Kuina he would remember her warnings and told Zoro he would meet him in the New World.
• Mu Yu called goodbye to the villagers from his fishing boat and spotted Koshiro watching from a hidden hillock with a wine gourd.
• A Sea King appeared in front of Mu Yu’s boat and opened its jaws to swallow him.
• Mu Yu used Conqueror’s Haki to frighten the Sea King into fleeing back into the sea.
• The villagers cheered, and Zoro and Kuina watched in shock as Mu Yu became a legend before he had even left the village.

After leaving the One Piece World, Mu Yu returned to the Garden of the Gods and received a mysterious divine artifact and a second poverty-alleviation package. Once he started growing Senzu Beans, the System sent him to the Demon Slayer: Kimetsu no Yaiba world.

• Mu Yu tossed a message in a bottle into the East Blue and left the One Piece World, earning energy points and a chance to fish up another bottle.
• Mu Yu fished up Xiaoxiao's message and received a Blue Bracelet that the System identified as a high-level divine artifact capable of altering fate and interfering with karma.
• Mu Yu put on the Blue Bracelet, found it too powerful for him, and tucked it away.
• The Poverty Alleviation Office sent Mu Yu Senzu Bean cultivation materials, seeds, and fertilizer, and Mu Yu began growing the beans in his courtyard.
• Three days later, the System identified the next world as Demon Slayer: Kimetsu no Yaiba, and Mu Yu entered a snow-covered forest.

Mu Yu arrived in the Demon Slayer World and watched Tanjiro struggle to save his newly transformed demon sister, Nezuko. Giyu Tomioka arrived to kill Nezuko, but Mu Yu's hidden killing intent unsettled him, and the chapter ended with Giyu searching for its source.

• Mu Yu learned that he had entered the Demon Slayer World and recognized Tanjiro and Nezuko as the story's events began.
• Nezuko woke as a demon, attacked Tanjiro, and nearly overpowered him, but Tanjiro refused to fight her and begged her to endure.
• Nezuko cried at Tanjiro's pleas, while Mu Yu felt their grief through Observation Haki and tried to restrain himself from interfering.
• Giyu Tomioka arrived and swung his Nichirin Blade at Nezuko, but Tanjiro pushed her aside and exposed himself to the strike.
• Giyu's slash cut Tanjiro's hair and sent him and Nezuko into a tree, while Giyu sensed killing intent behind him and found no one there.

Giyu tested Tanjiro’s resolve and saw Nezuko protect her brother, so he spared her and knocked her unconscious. Mu Yu left after confirming Tanjiro and Nezuko were safe, while Giyu sensed the hidden presence again.

• Giyu seized Nezuko and prepared to kill her as Tanjiro begged him to spare his sister.
• Giyu rebuked Tanjiro for his helplessness and stabbed Nezuko to provoke him into fighting back.
• Tanjiro threw a stone and used an axe feint to surprise Giyu, but Giyu knocked him down.
• Nezuko broke free and stood protectively over Tanjiro, convincing Giyu that the siblings were different.
• Giyu spared Nezuko and knocked her unconscious, while Mu Yu left and Giyu sensed the concealed presence again.