Chapter Summaries

Mobius strengthened his ties with Neptune and accepted the post of Fish-Man Island’s national advisor, then set out to explore the island with Shyarly and Hatchan. He planned to pursue the Mark-Mark Fruit and the red Poneglyph while Neptune considered a bold idea about his eldest son.

• Neptune arrived after Mobius defeated Jinbe in a sparring match and praised Mobius’s wisdom and strength.
• Neptune invited Mobius, Jinbe, Hatchan, and the three princes to breakfast, where Mobius considered how to deal with Vander Decken IX and Hody Jones.
• Mobius suggested opening a mermaid ocean restaurant as part of future trade with Whitebeard, and Neptune said he would leave the idea to him.
• Neptune proposed announcing Mobius as Fish-Man Island’s national advisor, and Mobius accepted the appointment.
• Mobius asked Shyarly and Hatchan to accompany him around Fish-Man Island, while Jinbe stayed to protect Neptune.
• After Mobius departed, Shark Star praised him, and Neptune considered a bold idea involving his eldest son.

Mobius visited the Sea Forest with Hatchan and Shyarly, took the two Poneglyphs, and asked Shyarly to locate a Devil Fruit on Fish-Man Island. Shyarly found one among the wrecks, where Vander Decken was already searching for treasure.

• Hatchan led Mobius and Shyarly to the two Poneglyphs in the Sea Forest.
• Mobius stored both Poneglyphs in his body with his Devil Fruit ability after confirming they were not useful to Fish-Man Island.
• Mobius asked Shyarly to use her fortune-telling ability to search Fish-Man Island for a Devil Fruit.
• Shyarly located a Devil Fruit in a pile of sunken ships.
• Vander Decken ordered his crew to turn over the wrecks and claim their wealth.

Mobius took the Mark-Mark Fruit from Vander Decken IX’s recovered treasure chest and stopped the pirate’s ambush on Hatchan. After Wadatsumi knocked Hatchan unconscious, Mobius prepared to fight Vander Decken IX while a powerful presence approached Fish-Man Island.

• Vander Decken IX ordered Wadatsumi and his crew to search sunken ships for treasure.
• A fish-man found a captain’s chest, and Vander Decken IX prepared to open it before Mobius pulled it away and claimed the Mark-Mark Fruit inside.
• Vander Decken IX recognized Hatchan, pretended to be innocent, then threw knives at him when Hatchan hesitated.
• Mobius stopped the knives with water control, but Wadatsumi struck Hatchan unconscious after Vander Decken IX ordered him to attack.
• Mobius gathered Thunder Roar to retaliate against Vander Decken IX and his crew.
• A horned brute aboard a stolen ship sensed a powerful presence near Fish-Man Island and laughed in anticipation.

Mobius defeated Vander Decken IX and his crew, claimed the Mark-Mark Fruit, and returned to Sea Forest with Hatchan. Meanwhile, Kaido crashed into Fish-Man Island, knocked out nearly everyone with his presence, and headed toward the palace.

• Mobius ate the Mark-Mark Fruit and bound the defeated Vander Decken IX, Wadatsumi, and their men.
• Mobius praised Hatchan for recognizing the value of physical strength, and Hatchan resolved to become as muscular as Jinbe.
• Mobius returned to Sea Forest and told Shyarly that her divination ability had helped him find what he needed.
• Kaido launched himself from a ship toward Fish-Man Island, and the ship sank after its coating burst.
• Kaido crashed through Fish-Man Island's coating, announced his arrival, and knocked out nearly all the residents with his overwhelming aura.
• Kaido looked toward the palace and decided to visit the island's royalty.

Kaido attacked Fish-Man Island, defeated Jinbe, and faced Mobius, who revealed his own dragon transformation. The two unleashed their powers against each other, engulfing much of the island’s upper level in fire and lightning.

• Mobius sensed Kaido’s presence and rushed toward Fish-Man Island after making sure Shyarly and Hatchan were safe.
• Jinbe attacked Kaido with Fish-Man Karate, but Kaido blocked his strikes and defeated him with Thunder Bagua.
• Kaido noticed Mobius and learned that he was Fish-Man Island’s national advisor and a member of the Naval Science Unit.
• Mobius transformed into a dragon, and Kaido revealed his own dragon form before the two exchanged Heat Breath and Thunder Roar.
• Their attacks collided, covering nearly all of Fish-Man Island’s upper level in fire and lightning.

Mobius fought Kaido at Ryugu Palace, revealing his rapid self-regeneration and unusual transformations but suffering from Kaido’s superior Haki and combat experience. As Kaido attacked the golden dragon sculpture, it remained unharmed, and mysterious writing revealed Mobius had assimilated it into a Poneglyph.

• Kaido and Mobius exchanged powerful blows, leaving both injured before Mobius healed himself with Salamander: Self-Regeneration.
• Kaido invited Mobius to join his crew, but Mobius refused, so Kaido unleashed his Conqueror’s Haki and attacked in earnest.
• Mobius transformed into Suanni Form, dodged Kaido’s strike, and used smoke to obscure his presence.
• Kaido transformed into a colossal dragon and blew away the smoke, then noticed Mobius was gone and spotted the golden dragon sculpture moving atop Ryugu Palace.
• Kaido struck the sculpture with Bad Wind, but it remained unharmed as the words “Island: Assimilation: Poneglyphs!” appeared across its abdomen.

Mobius used the Poneglyphs to withstand Kaido’s attacks, then exploited Dark Water and a flood of seawater to defeat and send him into the deep sea. Whitebeard arrived as a massive warship approached Fish-Man Island, and Harald greeted Newgate.

• Mobius assimilated himself and the Poneglyphs into Ryugu Palace’s golden dragon, enduring Kaido’s barrage until Kaido’s Conqueror’s Haki shattered the statue and expelled the undamaged Poneglyph.
• Kaido decided to kill Mobius after he refused to submit, but Mobius grabbed him and used Dark Water to strip away his Azure Dragon powers.
• Mobius summoned a torrent of seawater that swept Kaido through Fish-Man Island’s bubble membrane and into the deep sea.
• Whitebeard arrived and Mobius insisted he had only survived because Kaido had held back, then left to check on Neptune.
• A massive warship approached Fish-Man Island, and Harald greeted Whitebeard while two others decided to wait and see.

After Kaido’s battle with Mobius, Mobius sensed the Charlotte Family entering Ryugu Palace to seize Neptune and confront him. He revealed himself, rejected Katakuri’s offer to join the family, and the encounter erupted into a fight.

• Mobius reflected on how Kaido’s Haki had overwhelmed his Devil Fruit abilities and resolved to keep improving his Haki.
• Mobius sensed Whitebeard and Harald staging a fight, then rescued the unconscious Jinbe and searched Ryugu Palace for Neptune.
• Mobius detected four unfamiliar presences and identified them as Katakuri, Daifuku, Oven, and Mont-d'Or of the Charlotte Family.
• Katakuri offered Mobius a place in the Charlotte Family through marriage, but Mobius refused and urged Katakuri to take his siblings away from Big Mom.
• Daifuku summoned his genie and attacked Mobius, who caught its naginata; Daifuku followed with Thunder Roar, and Katakuri stepped in with Mochi Pounding.

Mobius used his Devil Fruit abilities to capture Mont-d'Or and defeat Daifuku, then countered Katakuri and Owen's combined attack. Katakuri faced Mobius alone and ordered Owen to run, determined to protect his family.

• Katakuri blocked Mobius's lightning attack, then ordered his brothers to retreat when he realized the danger.
• Mobius seized Mont-d'Or and made him vanish, then swallowed Daifuku's genie and knocked Daifuku unconscious through its reflected damage.
• Owen attacked Mobius with heat, but Katakuri redirected Owen's flames into his awakened mochi and launched a barrage of burning fists.
• Mobius transformed into Taotie and swallowed Katakuri's attack, leaving Katakuri shaken by the monster's appearance.
• Katakuri tore off his scarf, told Owen to run, and charged Mobius with his trident to protect his family.

Mobius defeated Katakuri, Daifuku, Owen, and Mont-d'Or beneath Fish-Man Island, stole their Devil Fruits, and killed them. As Rayleigh and Shakky descended to investigate the battle, Big Mom learned her sons had died and sent Totto Land to find their killer.

• Mobius swallowed Owen's heat, subdued him, and captured him alongside Daifuku, while Katakuri and Mont-d'Or were already unconscious.
• Mobius took the Book-Book, Mochi-Mochi, Heat-Heat, and Puff Puff Fruits, killed the four brothers, and left Neptune's family in his care.
• Mobius used Observation Haki to watch a day-long battle between two powerful fighters, then Rayleigh and Shakky set out for Fish-Man Island to look for Hancock and the other girls.
• Perospero saw Katakuri and the other three Vivre Cards burn to ash and blamed himself for sending them to Fish-Man Island.
• Big Mom learned Katakuri had died, regained enough composure to demand revenge, and ordered Totto Land to find the killer.

After the battle at Fish-Man Island, Neptune reconciled with Harald and agreed to pursue acceptance by the surface nations, while Mobius helped organize relief for the island. Kaido remained stranded underwater and encountered the young Jack.

• Mobius led Neptune and Jinbe outside Ryugu Palace, where they found Whitebeard and Harald discussing the battle.
• Neptune reassured Harald that he understood why Harald had fought, but Harald initially refused Neptune's invitation to drink because he still had a mission.
• Mobius asked Harald to advise Fish-Man Island on reaching the surface and earning acceptance, and Harald agreed to stay and help Neptune.
• Neptune, Whitebeard, and Harald sent their crews and doctors to treat the island residents, while Mobius went to retrieve Shyarly and Hatchan.
• Kaido lay on the seafloor recovering and recalling his fight with Mobius until he met the thirteen-year-old fish-man Jack.

Mobius explained how Kaido, Whitebeard, and Harald’s arrival had brought a day of fighting to Fish-Man Island, then escorted Shyarly and Hatchan to Ryugu Palace. There, Hody Jones antagonized them and left for the Fish-Man District, while Mobius prepared to meet Shyarly’s family.

• Mobius told Hatchan that Kaido, Whitebeard, and Harald had come to Fish-Man Island and that Whitebeard had fought Harald while Mobius defeated Kaido.
• Shyarly asked if Mobius had saved the island, and he said he had defeated Kaido and kept his promise to Fish-Man Island before telling her she would come with him.
• Mobius brought Shyarly and Hatchan to Ryugu Palace, where Hody Jones insulted Shyarly for being with a human and warned that he would tell her brother.
• Hatchan defended Mobius as Fish-Man Island’s savior, while Mobius told Hody that Neptune’s plan might require his help.
• Hody abandoned his guard duty and headed for the Fish-Man District, and Mobius told Shyarly he would meet her family and asked what gift to bring her brother.

At a banquet in Ryugu Palace, Mobius proposed that Whitebeard build wealth through trade across the islands under his command, with Fish-Man Island providing support and a trustworthy king or merchant acting as legal representative. The discussion paused when Shakky and Rayleigh arrived, and Mobius considered whether to involve Shakky in the plan.

• Neptune invited Mobius to a banquet attended by Whitebeard, Harald, and their companions, then urged him to explain his plan.
• Mobius teased Whitebeard about being poor and argued that his territory and connections with kings could support profitable trade routes.
• Mobius described tolls, protection fees, investment, and outside merchants as ways for Whitebeard to earn money, while Marco vouched for the Moby Dick's navigator.
• A woman interrupted Mobius's explanation and suggested Fish-Man Island could provide funds and a reliable person could serve as legal representative.
• Whitebeard recognized Shakky and Rayleigh when they arrived, and Mobius introduced himself as a member of the Naval Science Unit and Fish-Man Island's National Advisor.
• Shakky asked Mobius to continue explaining the plan, and Mobius considered asking her to take part.

Mobius persuaded Shakky to help build a trading network linking Kuja Island, Whitebeard, Fish-Man Island, and Elbaf, with Fish-Man Island as its potential base. He then revealed that Kozuki Oden had died fighting Kaido in Wano Country, provoking Whitebeard’s fury.

• Mobius asked Shakky to join the business venture, and she agreed after considering Kuja Island’s need for allies.
• Mobius proposed using the Florian Triangle as a trading hub, while Neptune listed Fish-Man Island’s resources and the group discussed a shared base.
• Mobius suggested Fish-Man Island as the foundation for their network and asked Whitebeard and Rayleigh if they remembered Kozuki Oden.
• Mobius revealed that Oden had been in Wano Country and had died fighting Kaido, causing Whitebeard’s rage to split the deep sea around Fish-Man Island.

Mobius told Whitebeard and the others how Kaido and the Kurozumi Clan had taken Wano Country and killed Kozuki Oden, prompting Whitebeard and Rayleigh to prepare an expedition. As the group began planning their route into Wano, Mobius noticed Harald’s grief and wondered if the giant king had just lost his wife.

• Whitebeard restrained his anger and demanded Mobius tell him everything he knew about Oden’s fate.
• Mobius recounted Kaido’s alliance with the Kurozumi Clan and Oden’s execution, prompting Whitebeard’s crew to call for revenge.
• Mobius revealed Wano Country’s wealth and admitted he wanted to settle his own grudge against Kaido.
• Whitebeard agreed to go to Wano Country, and Rayleigh asked Harald to contact Gaban for help.
• Mobius demonstrated his ability to create Flame Clouds, while Harald silently withdrew and Mobius wondered if Ida had died.

Mobius proposed that the Whitebeard Pirates use Wano Country as a nation through which to form alliances with the Giant Kingdom, Kuja Island, and Fish-Man Island. The talks ended with Harald pledging support, Shakky seeking news of abducted Kuja warriors, and Mobius revealing where Dorry and Brogy were and that two giants were trapped at Enies Lobby.

• After Whitebeard left the negotiations, Mobius proposed that the Whitebeard Pirates take over Wano Country and ally with the three nations in its name.
• Marco accepted Mobius's proposal for now, while Harald pledged the Giant Kingdom's support, Shakky offered to consult her sister, and Neptune agreed to contact Tiger.
• Shakky told Neptune she was seeking news of Kuja warriors abducted to Mary Geoise, and Harald offered to help her.
• Mobius told Harald that Dorry and Brogy were on Little Garden and that two giants were being held at Enies Lobby under false pretenses.
• Harald resolved to bring the two imprisoned giants home.

Mobius secured Harald’s friendship with an invitation to Elbaf, then secretly explored his new Devil Fruit powers and discovered that the Steam-Steam Fruit could create obedient smoke puppets. The chapter ended with Fisher Tiger reading a report that the Whitebeard Pirates planned to occupy Fish-Man Island and returning to find a crowd of starving people waiting for him.

• Mobius and Harald agreed to visit Elbaf, and Harald left Fish-Man Island to bring Dorry, Brogy, and the others home.
• Mobius examined the Book-Book Fruit, tested its ability to record objects truthfully, and created a basic world inside its pages.
• Mobius explored combinations between his Devil Fruits and found that the Steam-Steam Fruit could produce smoke demons that became mindless puppets when split apart.
• Fisher Tiger read a newspaper claiming the Whitebeard Pirates intended to occupy Fish-Man Island and hurried back to investigate.
• Fisher Tiger returned to find a ragged crowd of humans, Fish-Men, merfolk, giants, and others waiting for him.

Mobius met Arlong at the Mermaid Cafe to discuss Shyarly leaving Fish-Man Island with him, while the Whitebeard Pirates joined their conversation. Mobius said Tiger would soon return, and a voice outside announced that Tiger was back.

• Namur led Marco and the Whitebeard Pirates to the Mermaid Cafe, where Marco spotted Mobius with Shyarly and Arlong.
• Arlong demanded that Shyarly leave with him, but she refused and said she had promised to travel with Mobius.
• Marco caught Arlong's fist when he attacked Mobius, and Namur defended Mobius's ability to care for Shyarly.
• Mobius clarified that he valued Shyarly's abilities and asked Arlong to hear Tiger's view before deciding whether to accept her choice.
• A voice outside the cafe announced Tiger's return, and Mobius calmly noted that he had said it would not be long.

Fisher Tiger returned to Fish-Man Island and reunited with Jinbe, Arlong, and the others, then learned Mobius and the island’s allies wanted his help. The group agreed to return rescued slaves to their homes and shelter those with nowhere else to go.

• Jinbe welcomed Tiger back and explained Mobius’s plans to strengthen Fish-Man Island through alliances.
• Tiger reunited with Arlong and the Whitebeard Pirates, then met Mobius and agreed to help him.
• At a feast, Shakky asked Tiger about Hancock and her two sisters, whom she hoped to reunite with Kuja Island.
• Tiger explained that he wanted to return the people he had rescued to their homes, and Whitebeard offered his fleets to help.
• Mobius asked Fish-Man Island, the Whitebeard Pirates, and Kuja Island to shelter people without homes, and Neptune, Otohime, Whitebeard, and Shakky agreed.

After Tiger brought the freed slaves to Fish-Man Island, Mobius helped settle them and arranged a census to identify their skills. He recognized Gild Tesoro among the rescued slaves and approached him with a job offer, while Tesoro resolved to pursue wealth.

• Shakky reunited with Hancock and her younger sisters as Tiger, Neptune, Jinbe, and the Whitebeard Pirates brought the freed slaves to Fish-Man Island.
• Mobius urged Neptune to census the slaves and the Fish-Man District, and Neptune agreed to the plan.
• The rescued slaves were settled, with skilled workers assigned to factories, former pirates joining Whitebeard, and Shakky taking in homeless female warriors.
• Mobius found Gild Tesoro's report and asked Shyarly to divine his future; she saw images of a golden ship, a casino, and luxury.
• Tesoro planned to leave and make money until Mobius summoned him and offered him a job.