Chapter Summaries

Katsuo met with Dr. Vegapunk to learn about his unusual brain and the Brain-Brain Fruit. Vegapunk warned that the fruit might be controlling him, while carefully appealing to Katsuo to spare his life.

• After sleeping for two days, Katsuo resumed copying Devil Fruits and summoned Dr. Vegapunk to meet him.
• Katsuo stored the chest of natural Devil Fruits in the Kamui Dimension and asked Vegapunk about his enlarged brain and altered body.
• Vegapunk explained that his rapidly growing brain consumed his body's nutrients and overwhelmed him with desires, leading him to remove most of it.
• Katsuo proposed that the Brain-Brain Fruit could merge with its user's brain, develop self-awareness, and use the user's body to control them.
• Vegapunk suggested that the brain could be deceived, but admitted it might know about the deception and allow it.
• Vegapunk told Katsuo that he wished to survive and submitted to his judgment, hoping his explanation of the fruit's dangers would protect him.

Katsuo used two illusions to control Vegapunk and ordered him to develop a way to extract Devil Fruit powers intact, using captured ability users for experiments. He then took Chopper to Kaguya as her companion for three years and ordered the Navy to release the Straw Hat Crew.

• Katsuo implanted Kotoamatsukami and a Rinnegan illusion in Vegapunk, ensuring the scientist would obey him.
• Vegapunk explained the limits of his Artificial Devil Fruit research and said he might be able to extract a user's power if their life was disregarded.
• Katsuo ordered Vegapunk to focus on extracting Devil Fruit powers intact and promised him laboratories, funding, and Navy-provided test subjects.
• Chopper agreed to stay with Katsuo for three years if Luffy and the others were released, and Katsuo ordered the Navy to free the Straw Hat Crew.
• Katsuo brought Chopper to Kaguya in the Flower Chamber, where she welcomed the reindeer as a cute companion.

Katsuo and Kaguya planned to use Princess Shirahoshi and Sea Kings to restore the Divine Tree, while Kaguya tried to persuade Katsuo to avoid confronting the Otsutsuki Clan. Their argument over her pregnancy and whether she would join the fight left them at an impasse.

• Katsuo told Kaguya that the Divine Tree had received the dead from the Marineford War and was recovering quickly.
• Katsuo proposed moving the Divine Tree to the seaside and using Princess Shirahoshi's power to lure Sea Kings into a sacrificial bay.
• Kaguya urged Katsuo to avoid the Otsutsuki Clan Lands, but he insisted that the clan problem had to be resolved.
• Kaguya revealed that she was pregnant, and Katsuo reassured her that he would not abandon her or the others.
• Katsuo told Kaguya to stay behind while he and Madara faced the Otsutsuki Clan, but she refused and said she would help him even if she had to give up the child.

Katsuo moved the Divine Tree to a secluded seaside bay and arranged for Shirahoshi to supply it with sea beasts. Kaguya remained angry with him and watched as he disappeared underground, wondering what he was doing.

• Katsuo asked Chopper to coax Kaguya, but Chopper refused because he feared her Byakugan.
• Katsuo moved the two Divine Trees to the seaside, carved out a bay, and raised towering earthen walls around it.
• Katsuo instructed Shirahoshi to periodically send sea beasts into the bay and promised to arrange an underwater palace for her.
• Katsuo sank underground, leaving Kaguya unable to follow his movements with her Byakugan.
• Kaguya wondered what Katsuo was doing beneath the earth and told Chopper to stop interrupting her.

Katsuo confronted the One Piece World’s Star Spirit about the two Demon Trees draining its power and asked to borrow some of its Power of Creation in exchange for karma. The Star Spirit remained wary and refused, while Katsuo warned that other powerful races could threaten it and left the choice between cooperation and force.

• Katsuo reached the planetary core and found the Star Spirit bound by the two Demon Trees.
• Katsuo told the Star Spirit that strength ruled the universe but claimed he preferred negotiation and would repay the power he borrowed.
• The Star Spirit accused Katsuo of following demonic ways and questioned his motives.
• Katsuo admitted he wanted the Star Spirit’s Power of Creation and offered to forge karma with it, but the Star Spirit refused.
• Katsuo warned that the Otsutsuki Clan and the Devourer Clan threatened planets, then said the Demon Trees could remain draining the Star Spirit if it continued to refuse him.

Katsuo bargained with the Pirate Star Spirit for Power of Creation and agreed to a Causality Contract requiring him to bring Urouge. After learning Urouge's location, Katsuo pulled him from his ship with a massive energy hand.

• Katsuo showed the Star Spirit a portion of the Ninja Star Spirit's Power of Creation and asked to borrow some of its own.
• The Star Spirit offered free Power of Creation if Katsuo withdrew God Tree Number Ten and stopped the Demon Trees from absorbing its power, and Katsuo withdrew the tree's roots.
• Katsuo negotiated the loan up to one-fiftieth of the Star Spirit's Power of Creation, accepting that some resulting causality would fall on him.
• The Star Spirit required Katsuo to bring Urouge so they could establish a Causality Contract through the Causality Devil Fruit.
• Katsuo located Urouge in the New World and seized him from the Fallen Monk Pirates' ship with a massive hand of energy.

Katsuo accepted the Star Spirit’s Causality Devil Fruit and gained the ability to perceive karma threads, then received a large mass of the Pirate Star Spirit’s Power of Creation. He left with a thousand-year karmic debt to repay and began storing the energy in his Yang Seal space.

• The Star Spirit extracted Urouge’s Devil Fruit and offered it to Katsuo with a contract requiring him to repay his karmic debt within a thousand years.
• Katsuo considered refusing the deal and taking the power by force, but the Star Spirit warned him that doing so would bring only karmic debt.
• Katsuo ate the Causality Devil Fruit and used his Rinnegan to perceive karma threads linking him to people and places, including Uchiha Madara and Kaguya.
• Katsuo asked the Star Spirit for its Power of Creation and received a deep-blue orb that the Star Spirit said reflected its ocean-dominated world.
• Katsuo judged the orb to contain far more energy than the Ninja Star Spirit’s gift and stored it in his Yang Seal space.

Katsuo left the Star Spirit after taking two percent of its Power of Creation, causing widespread environmental damage across the One Piece World. He returned Urouge to his ship, reconciled with Kaguya, and agreed to connect their worlds so she could remain in the One Piece World while he dealt with the Otsutsuki Clan.

• The Star Spirit dismissed Katsuo after its Power of Creation loss triggered worsening drought, rising seas, mass plant deaths, extinctions, and ocean disruptions across the One Piece World.
• Katsuo spared the unconscious Urouge, taught him Haki cultivation methods, returned him to his pirate ship, and watched their Karma Thread disappear.
• Katsuo found Kaguya waiting for him and promised to teach her a consciousness-sharing Clone Technique so she could accompany him through a clone.
• Katsuo told Kaguya that he had removed Number Ten's roots and said he would soon set out again to settle his karma with the Otsutsuki Clan.
• Kaguya asked to stay in the One Piece World, and Katsuo agreed to create a passage linking it to the Ninja World.

Katsuo connected a spatial altar in Pangea Castle to the Kamui Dimension, establishing a passage between the One Piece and Naruto worlds. He then used the Power of Creation to carve a pattern into his primordial spirit, successfully completing the hardest step of his plan before returning to the Flower Chamber exhausted.

• Katsuo built a spatial altar in the Flower Chamber and used his Space-Time Spell to connect it to the Kamui Dimension.
• Katsuo entered the Kamui Dimension, where his enormous Truth-Seeking Orb Skeleton stood, and linked its altar to the One Piece World altar.
• Katsuo explained that the altars could connect the One Piece and Naruto worlds, but their energy limits restricted ordinary travelers to one passage every three years.
• Katsuo sat beneath the skeleton and used the Power of Creation to carve a mysterious pattern into his primordial spirit.
• Katsuo completed the pattern, stored the remaining Power of Creation instead of using it to recover, and returned to the Flower Chamber in a weakened state.

After waking from ten days of exhaustion, Katsuo gave Kaguya Otsutsuki a cluster of Power of Creation to help her and their unborn child. The embryo absorbed most of it, gaining the possibility of becoming a Primordial Body and surpassing the limits of its parents’ bloodlines.

• Katsuo woke beside Kaguya Otsutsuki after ten days unconscious and sensed their tiny embryo.
• Katsuo gave Kaguya Otsutsuki a cluster of Power of Creation he had taken from underground.
• Katsuo transferred the energy to Kaguya Otsutsuki through a kiss when she insisted he explain his earlier exhaustion first.
• Kaguya Otsutsuki refined the Power of Creation, but the embryo absorbed more than half of it on its own.
• Katsuo and Kaguya Otsutsuki realized the embryo could become a Primordial Body and exceed their bloodline limits.

Katsuo explained the three paths of cultivation to Kaguya Otsutsuki and showed how Devil Fruits could help them study the power of rules. Three months later, Uchiha Madara returned to Mariejois after his travels and revealed that his Haki had advanced, leaving Katsuo to suspect he wanted a fight.

• Kaguya Otsutsuki celebrated the improvements to her Chakra, physique, and eye power after absorbing some of the Power of Creation.
• Katsuo received the Devil Fruits Vegapunk had sent and explained the paths of Dao, Law, and Technique to Kaguya Otsutsuki.
• Katsuo said Devil Fruits contained rule fragments that could help them reach higher cultivation realms, and he and Kaguya studied their powers together.
• Uchiha Madara returned to Mariejois three months later, saying his travels had become dull after people recognized him.
• Uchiha Madara told Katsuo that the Three Colors of Haki had advanced, and Katsuo guessed he had returned to fight.

Uchiha Katsuo and Uchiha Madara fought in a deep-sea Haki showdown, each using Conqueror’s Haki to challenge the other. Katsuo gained the advantage, but Madara used Observation Haki to evade Katsuo’s escalating attacks.

• Uchiha Madara dismissed Katsuo’s strength and accepted his challenge, while Katsuo mocked him and sent Kaguya Otsutsuki to watch from a distance.
• Uchiha Madara and Katsuo unleashed their strongest Conqueror’s Haki, splitting the sea and stirring violent storms and lightning.
• Katsuo’s Haki overwhelmed Madara’s, pushing him back more than a hundred meters until Madara broke their Haki walls with a punch.
• Katsuo attacked Madara with increasingly powerful black Pillars of Light, and Madara first blocked them with his iron fists.
• Madara closed his eyes and dodged Katsuo’s attacks with Observation Haki, surprising Katsuo.

Uchiha Katsuo and Uchiha Madara fought over their mastery of Haki, with Madara briefly gaining the advantage through Observation Kill before Katsuo countered him with Conqueror’s Haki. The battle ended with Madara revealing a gigantic tiger formed from his Crimson Haki Manifestation.

• Uchiha Madara used Observation Kill to suppress Katsuo’s Observation Haki and sent him flying with a punch to the face.
• Katsuo recovered and admitted Madara was better at Observation Haki, then closed in while releasing Conqueror’s Haki.
• Katsuo disrupted Madara’s Observation Haki and struck him in the face, explaining that his Conqueror’s Haki domain suppressed the other two types of Haki.
• Uchiha Madara refused to concede and unleashed a Crimson Haki Manifestation that took the form of a gigantic tiger.

Katsuo and Uchiha Madara fought with gigantic beasts formed from their Conqueror’s Haki. Katsuo’s Five-Clawed Black Dragon destroyed Madara’s crimson tiger, leaving Madara exhausted and defeated.

• Madara sent his crimson tiger to attack Katsuo’s emerging black dragon, but Katsuo rapidly manifested the thousand-meter-long Five-Clawed Black Dragon.
• The dragon defeated the tiger in their first clash, then evaded its underwater ambush and attacked with black lightning.
• Katsuo’s repeated lightning strikes and the resulting seawater explosions slowed the tiger and destroyed one of its hind legs.
• Madara and Katsuo fired beams of energy from their beasts, and the dragon’s black beam overwhelmed and annihilated the tiger.
• Madara was severely affected by the tiger’s dispersal and lay gasping on the sea, having lost the Haki battle.

Katsuo taught Uchiha Madara a new sealing technique so he could seal Divine Tree Number Ten within himself and draw out all of its power. Madara entered the God State, while Katsuo remained far beyond him in true strength.

• Katsuo transformed Divine Tree Number Ten into the Ten-Tails and explained that his sealing technique could extract all of its power.
• Katsuo taught Uchiha Madara the Sage Power Seal formula and hand seals, adapting it to use Truth-Seeking Orbs and Rinnegan ocular power.
• With Katsuo's help, Uchiha Madara sealed Divine Tree Number Ten inside himself and became its Jinchuriki.
• Katsuo noted that the Ten-Tails' power could not raise Madara beyond the peak of the Six Paths Level, then advised him to activate Sage Mode and the Yang Seal.
• Uchiha Madara combined Sage Mode, Yang Seal Release Mode, and Six Paths Jinchuriki Mode to enter the God State.
• Kaguya Otsutsuki watched Madara display his power and wondered how it compared with Katsuo's true God State, which Madara remembered as far more imposing.

Uchiha Madara asked Katsuo to teach him true sage arts, and Katsuo explained the humility and sacrifice required to pursue greater strength. After a hundred Sea Kings were sacrificed to the Divine Tree, Kaguya Otsutsuki harvested three fruits containing nourishing Blood Qi essence.

• Uchiha Madara asked Katsuo to teach him true sage arts, then bowed after Katsuo challenged his pride and praised his willingness to seek guidance.
• Katsuo said Madara would have to abandon his Chakra and Ten-Tails power to learn sage arts, and promised to teach him after the coming battle if he survived.
• A hundred Sea Kings entered the inner bay, where Kaguya Otsutsuki's Divine Tree killed them in a blood sacrifice.
• Kaguya Otsutsuki obtained three blood-red fruits from the Divine Tree and gave two to Katsuo and one to Uchiha Madara.
• Kaguya Otsutsuki explained that the fruits contained Blood Qi essence that nourished Blood Qi and strengthened the body without side effects.

Katsuo teased Uchiha Madara with a rumor that he loved Senju Hashirama, then walked with Kaguya through Mariejois and spotted a woman disguised as a man. That night, a masked intruder slipped into Pangea Castle after overhearing where the Sovereign was supposedly working.

• Katsuo fed Kaguya a Scarlet Fruit and openly told Uchiha Madara that she was pregnant.
• Katsuo claimed Shimura Danzō and Utatane Koharu had spread a rumor that Madara liked Senju Hashirama, and Madara stormed off after Katsuo kept teasing him.
• Katsuo and Kaguya strolled through Mariejois, where Katsuo noticed a disguised woman glaring at Pangea Castle with hatred.
• A masked figure carrying a spiked club evaded the plaza sentries and entered Pangea Castle.
• Two naval officers said the Sovereign was working in Lounge No. 1 on the second floor, and the intruder hurried toward it.

Katsuo killed Blackbeard and copied the law fragments from his Devil Fruits. He then captured the masked woman who called herself Kozuki Oden and discovered she was Kaido’s daughter.

• Akainu sent Kizaru to capture Blackbeard, whom Katsuo had tracked using the collar around his neck.
• Katsuo killed Blackbeard and copied the darkness, devouring, power, and space law fragments from the blood orb.
• Katsuo recreated the Dark-Dark and Tremor-Tremor Devil Fruit powers before waiting for a visitor.
• A masked woman attacked Katsuo, claimed to be Kozuki Oden, and tried to pull back her Spiked Iron Club.
• Katsuo crushed the club, sealed the woman’s movements, and removed her mask, revealing that she was Kaido’s daughter.

Katsuo threatened to destroy Wano Country after Yamato tried to assassinate him, then turned her into a clone for Kaguya Otsutsuki. The chapter ended with the author’s note about Japan beginning to discharge nuclear-contaminated water into the ocean.

• Katsuo called Akainu and ordered him to kill the Kozuki family, then expanded the order to destroy all of Wano Country.
• Yamato revealed that she was Kaido’s daughter and begged Katsuo to spare Wano Country.
• Katsuo said he was targeting Wano because of the name Yamato and incapacitated her.
• Katsuo and Kaguya Otsutsuki used an improved Image Transformation Technique to create a powerful Kaguya clone from Yamato’s body.
• The author lamented Japan’s discharge of nuclear-contaminated water into the ocean.

Uchiha Katsuo and Uchiha Madara left the One Piece World to face the Otsutsuki Clan after Blood Karma erupted. Kaguya Otsutsuki remained behind, while Katsuo and Madara waited on a desolate star for the clan’s experts to arrive.

• Uchiha Katsuo said goodbye to pregnant Kaguya Otsutsuki, then used his Six Tomoe Rinnegan to leave the One Piece World with Uchiha Madara.
• Kaguya Otsutsuki watched their distant figures with her Byakugan, returned to Pangea Castle, and mourned Katsuo’s departure.
• Chopper told Cobra that Kaguya was crying because Katsuo had left, then asked him to monitor the Straw Hat Pirates and protect them from the Marines.
• Katsuo and Madara traveled beyond the One Piece World and settled on a desolate star to await the Blood Karma Light’s eruption.
• Madara suggested ambushing the Otsutsuki Clan’s experts, but Katsuo chose to face them directly.