Chapter Summaries

Zero completed a brutal trial that gave him combat skills, then arrived in the One Piece world aboard a small boat. He met Monkey D. Luffy, received a quest to help him become Pirate King and earn a ten-billion bounty, and spotted a colossal creature approaching.

• Zero survived the Trial Space and unlocked the passage to the One Piece world.
• Zero checked his status panel and discovered his skills, including max-level Conqueror's Haki, whose power depended on his level.
• Zero found himself on a small boat and watched Monkey D. Luffy burst out of a barrel.
• Zero received a main quest to help Luffy become Pirate King and reach a ten-billion bounty for the reward of a World Proof.
• Luffy asked Zero for food, then spotted a colossal creature near their boat.

Zero joined Luffy in confronting Alvida’s crew, defeated her pirates with Conqueror’s Haki, and stole her hat before Luffy knocked her into the sea. Luffy invited Zero to become his partner, and the two found Koby lying on the ship’s deck.

• Luffy stretched himself onto Alvida’s ship, and Zero recognized the encounter from the start of the story and received a quest to seize Alvida’s hat.
• Zero swam to the ship and joined Luffy as Alvida’s pirates chased him around the deck.
• Zero used Conqueror’s Haki to knock out most of the pirates, then dodged Alvida’s club and stole her hat.
• Luffy struck Alvida with a Gum-Gum Pistol, sending her into the sea.
• Luffy asked Zero to join his crew, and Zero agreed.
• Zero and Luffy noticed Koby lying on the deck and called out to him.

Zero reached the Marines' base with Luffy and Koby, where the confrontation with Captain Morgan and Helmeppo unfolded. After seizing Helmeppo's pistol and completing a side quest, Zero warned Luffy of a huge figure preparing to attack him from behind.

• Zero reviewed his level-up, noting that his attributes and the power of his skills had increased after completing a side quest.
• Zero arrived at the town, explored its streets, and hurried toward the Marines after spotting them gathering.
• Luffy fought Captain Morgan while Zoro held back the Marines, and Helmeppo took Koby hostage at gunpoint.
• Zero snatched Helmeppo's pistol, completed his side quest, and kicked Helmeppo away.
• Zero greeted Luffy, then spotted a huge figure raising an axe behind him and shouted a warning.

After leaving the Marine island, Luffy and Zoro learned about Shanks’s status as one of the Four Emperors before Luffy and Zero were carried away by a bird. They landed in a town where Nami was fleeing Buggy’s pirates, and the chapter ended with Luffy, Zero, and Nami discussing Buggy at a house.

• Zero received 50 experience points and 5,000 Beli for completing a side quest after Zoro defeated Colonel Morgan.
• Luffy told Zero and Zoro how Shanks had given him his straw hat and lost an arm saving him.
• Zero explained the Four Emperors and other powerful groups, and Luffy vowed to surpass Shanks.
• Luffy grabbed a large bird, which carried him and Zero away before they crashed into a town where Nami was being chased by Buggy’s pirates.
• Luffy defeated the pirates, and Nami led him and Zero to a house by offering them food.
• Zero told Luffy and Nami about Buggy’s bounty and Chop-Chop Fruit ability.

Zero stopped Buggy’s cannonball from hitting Luffy, then used Zoro’s sword to cut Luffy out of his cage. Luffy launched himself at Buggy as Zoro and Zero faced new opponents among the pirates.

• Nami and Luffy reached Buggy’s headquarters, where Buggy ordered the Buggy Ball aimed at the captive Luffy.
• Nami knocked out a pirate, but the Buggy Ball’s fuse was already lit, so she rushed to stop it.
• Zero intercepted the cannonball with his Haki and martial arts, completed his side quest, and reached level 3.
• Zero borrowed a sword from Zoro and cut through Luffy’s iron cage, inspiring Zoro to recall his master’s lesson about breath.
• Luffy challenged Buggy and launched himself at him, while Zoro faced a unicycle-riding swordsman and Zero confronted a pirate riding a lion.

Zero defeated Mohji and rescued Nami while Luffy and Zoro won their fights against Buggy’s crew. Nami joined the Straw Hat Pirates as a supposed business partner, and the group fled the town before discovering Luffy had given away their treasure.

• Zero used Conqueror’s Haki to knock Mohji unconscious, and Mohji’s beast carried him away.
• Luffy fought Buggy while Zoro thoroughly suppressed Cabaji, and Zero rescued Nami from the pirates surrounding her.
• Luffy defeated Buggy by gathering his scattered body parts and sending them flying, while Zoro defeated Cabaji.
• Luffy invited Nami to join the crew, and she accepted under the pretense of cooperating with them.
• The townspeople mistook the group for Buggy’s crew, so they fled aboard their ship, where Nami discovered Luffy had left their treasure for the townspeople and beat him.

Zero split from Luffy’s group with Nami to stop the Black Cat Pirates’ plan, then overwhelmed the crew aboard their ship. He wondered where the hypnotist had gone as Nami spotted him returning with strange figures behind him.

• A long-nosed young man named Usopp met Luffy’s crew and invited them to his village after learning Luffy knew his father, Yasopp.
• Zero separated from Luffy’s group to investigate the Black Cat Pirates, and Nami insisted on accompanying him.
• Zero and Nami found the Black Cat Pirates’ ship, and Zero went aboard alone while Nami waited on shore.
• Zero knocked out the pirates with Conqueror’s Haki and defeated the two cat-disguised fighters, but could not find the hypnotist.
• Nami decided to go help Zero, then saw him returning with strange figures behind him.

Zero exposed Klahadore as Captain Kuro and revealed that he had defeated the Black Cat Pirates aboard their ship. Kuro attacked Zero, but Luffy and Zoro joined the fight and overwhelmed him, leaving Kuro to unleash his Spoon technique.

• Klahadore insulted Usopp’s father, and Usopp punched him after he continued mocking him.
• Zero arrived and identified Klahadore as Kuro of a Hundred Plans, captain of the Black Cat Pirates.
• Zero brought Nami and two captured Black Cat Pirates forward, and they confirmed Kuro’s identity to Kaya and the others.
• Kuro revealed his Cat Claws and attacked Zero, but Zero dodged as Luffy and Zoro charged into the fight.
• Luffy and Zoro struck Kuro with a coordinated attack, sending him flying and leaving him injured.
• Kuro closed his eyes and invoked his Spoon technique.

Kuro’s attack on Kaya failed when Usopp knocked him unconscious, and the Straw Hat Pirates welcomed Usopp aboard the Going Merry. Zero raised his Swordsmanship skill to level 5, and the crew set course for the sea restaurant Baratie after meeting Johnny and Joseph.

• Kuro used Spoon to overwhelm Luffy and Roronoa Zoro, but Usopp shot him while he tried to seize Kaya as a hostage.
• Usopp said goodbye to Kaya and joined the Straw Hat Pirates, who received the Going Merry from Kaya’s family.
• Zero used his Skill Level Upgrade on Swordsmanship, raising it to level 5 and gaining insight into a new Sword Technique.
• Johnny confronted the crew after Luffy and Usopp accidentally destroyed the reef where he and Joseph had stopped; Nami treated Joseph’s illness.
• The crew decided to head to Baratie to find a cook.

Zero and the others reached Baratie, where Luffy’s mishap damaged the restaurant and they encountered Sanji and Gin. Four days later, Krieg’s battered ship appeared, activating quests for Zero to stop poison gas and survive a fight with Hawk-Eye Mihawk.

• Zero cut the Navy ship’s cannon in half with Rankyaku, but Luffy redirected another cannonball into Baratie and blasted a hole in the building.
• Zero, Zoro, Nami, and Usopp went to Baratie, where they saw Sanji stop Iron Fist Fullbody from fighting and Gin get thrown out after demanding food.
• Luffy declared that Sanji had joined the crew, but Sanji denied it and Gin left after thanking them.
• Four days later, Krieg’s badly damaged ship emerged from the fog, and Zero received quests to prevent Krieg from releasing poison gas and hold out against Hawk-Eye Mihawk for ten minutes.

Zero let Nami leave to pursue her own goal, then witnessed Hawk-Eye Mihawk destroy Krieg’s ship and defeat Roronoa Zoro. After Zoro vowed to Luffy that he would never lose again, Zero challenged Mihawk to a fight.

• Zero told Nami he would not stop her from leaving and promised that her companions would come find her; Nami embraced him before sailing away on the Going Merry.
• Zero told Johnny and Joseph they would go after Nami once they settled matters, then sensed Hawk-Eye Mihawk and unleashed an aura that knocked the two men unconscious.
• Mihawk split Krieg’s ship apart, and Krieg recognized him with terror as his crew fell into the sea.
• Roronoa Zoro challenged Mihawk, lost despite using Three-Sword Style Secret Technique, Three Thousand Worlds, and fell into the sea severely wounded.
• After waking, Zoro promised Luffy he would never lose again before becoming the world’s greatest swordsman, and Luffy accepted his resolve.
• Zero appeared before Mihawk, introduced himself, and challenged him to fight as his powerful aura filled the area.

Zero fought Mihawk in a fierce sword battle, revealing Conqueror’s Haki, Armament Haki, and a powerful fire-based attack. Mihawk acknowledged Zero’s strength and departed, promising to settle who was superior when they met again.

• Mihawk recognized Zero’s Conqueror’s Haki and challenged him to a fight.
• Zero coated a longsword with Armament Haki and split Mihawk’s slash, then attacked him with Soru and exchanged blows.
• Mihawk drove Zero back and launched five slashes, which Zero matched before their attacks collided in a powerful shockwave.
• Zero announced his strongest technique and unleashed a fire dragon, which Mihawk extinguished with the Black Blade.
• Mihawk acknowledged Zero’s strength and left, promising a rematch, while Zero’s sword broke as his Armament Haki faded.

After defeating Hawk-Eye, Zero rested aboard Baratie while Luffy and the chefs fought Krieg’s pirates. The battle left Sanji badly injured after Gin took Zeff hostage, and Luffy smashed the fin beneath them to stop the attack.

• Zero gained 1,000 experience points, leveled up to LV.5, and received an item lottery ticket after completing the challenge quest.
• Luffy caught the exhausted Zero before he fell, and Zero explained that the crew had to grow stronger for their future adventures.
• Krieg rallied his pirates to seize Baratie, while Sanji opened the restaurant’s fins and the chefs drove off attackers with fish-shaped boats.
• Mr. Pearl set the fin ablaze, and Luffy accidentally knocked him unconscious when Krieg’s iron ball broke a mast that fell on him.
• Gin took Zeff hostage to keep Sanji from fighting, but Mr. Pearl attacked Sanji while he was distracted and severely injured him.
• Luffy used a Rubber Axe to smash the fin beneath him, and Zero laughed at Luffy’s unconventional move.

Zero stopped Krieg from firing his poison gas bomb, and Luffy defeated Krieg, ending the attack on the Sea Restaurant. Sanji joined the Straw Hat Pirates and set sail with Luffy, Zero, and Joseph to pursue his dream of finding the All Blue.

• Zero threatened Krieg and Luffy destroyed the poison gas launcher before Krieg could use it.
• Luffy overcame Krieg’s weapons and iron net, defeated him, and was rescued from the sea by Sanji.
• Zeff asked Zero to take Sanji along, while Luffy invited Sanji to join the crew and learned about his dream of finding the All Blue.
• After overhearing Zeff and the chefs’ plan to send him off, Sanji decided to leave with Luffy and the others when Joseph arrived urging them to hurry to Nami’s island.
• Sanji thanked Zeff and set sail with Luffy, Zero, and Joseph as the newest member of the Straw Hat Pirates.

Zero explained Haki and the powerful pirates of the Grand Line to Luffy and Sanji, then led the crew toward Arlong with the help of a giant sea beast. They reached Arlong’s island, where Nami told them to leave, but Zero and Luffy asked her to return with them.

• Joseph explained that Arlong had served under Jinbe, one of the Shichibukai, and Zero told the crew about the Four Emperors, including Shanks.
• Zero offered to teach Luffy and Sanji Haki, demonstrated Armament Haki by striking Luffy, and then joined them for Sanji’s meal.
• Zero sensed something beneath the ship, and a giant horned sea beast appeared; Luffy knocked it down before Zero ordered it to take them to Arlong.
• The sea beast brought Zero to Arlong’s island, where he found Luffy, Sanji, Roronoa Zoro, Johnny, and Joseph facing Nami.
• Nami coldly told the crew to leave, but Zero and Luffy asked her to come back with them, and Zero called out her lie.

After Nami asked Luffy and the others for help against Arlong, they stormed Arlong Park, where Zero knocked out most of the fish-men with Conqueror's Haki. Luffy was thrown into the sea, Sanji was driven away, and an injured Zoro collapsed, leaving Zero to face Hachi with a short blade.

• Zero convinced Nami that the crew trusted her, and she tearfully asked Luffy and the others to help her.
• Luffy led the crew into Arlong Park, where Zero used Conqueror's Haki to knock out the fish-men minions.
• Luffy defeated Sea Cow Moo Moo, but Arlong then threw him into the sea with the floorboards beneath his feet.
• Kuroobi sent Sanji beyond the wall, while Zoro's injuries caught up with him and Zero carried him to safety.
• Zero faced Hachi and drew his dragon-engraved short blade, calling out, "Roar, Startled Dragon!"

Zero defeated Hachi with a powerful sword strike, then left Arlong and the Fish-Man Karate user to Luffy and Sanji. Sanji and Usopp won their fights, leaving Luffy and Arlong as the last combatants.

• Zero used his sword to defeat Hachi and completed his quest, earning experience points and Beli.
• Arlong charged at Zero, but Luffy struck him from behind while Sanji knocked down the Fish-Man Karate user.
• Luffy and Sanji took over the fight, and Zero returned to Nami’s side to watch.
• Sanji defeated the Fish-Man Karate user and rushed to Nami’s side, while Usopp returned after defeating a Fish-Man officer.
• Luffy and Arlong remained in the final showdown.

The Straw Hat Pirates defeated Arlong and celebrated with a three-day carnival on the island. Nami thanked Zero and rejoined the crew as they set sail, leaving the villagers furious after she stole their wallets.

• Luffy defeated Arlong, and the Straw Hat Pirates won the battle as Arlong Park collapsed around them.
• Colonel Nezumi arrived with Marines, but Roronoa Zoro beat them, and Nami made them handle the aftermath.
• During the island’s carnival, Zero told Nami what had happened while she was away and joked that a Devil Fruit let him see her memories when he touched her.
• Nami thanked Zero for helping her trust the crew, and she told him how wonderful it was to have them around.
• After three days of celebration, Nami ran through the villagers, leapt aboard the ship, and sailed away with the Straw Hat Pirates after they discovered she had stolen their wallets.

The Marines assigned Zero a 50 million Beli bounty for fighting Mihawk to a draw and possibly possessing Conqueror's Haki, while Luffy received a 30 million bounty. Aboard the Going Merry, Zero warned the crew about stronger Marines ahead and agreed to teach them Haki.

• A Marine officer announced Luffy's 30 million Beli bounty and Zero's 50 million bounty, citing Zero's fight with Mihawk and suspected Conqueror's Haki.
• Sengoku told Garp that Luffy had become a pirate and that one of his crewmates was extraordinary, leaving Garp troubled by his grandson's choice.
• The crew reacted to the bounty posters, and Zero warned them that the Marines on the Grand Line were far stronger than those in the East Blue.
• Sanji and Usopp asked Zero to teach them Haki, and Zero agreed.

Zero taught the Straw Hat crew about two uses of Armament Haki and demonstrated its power by destroying a Marine ship. The crew reached Loguetown, where Zero recognized Smoker and warned Luffy that the Marine captain’s smoke powers made him a dangerous opponent.

• Zero explained how Armament Haki could coat the body or weapons, then demonstrated weapon coating by cleaving a Marine ship in two.
• The crew chose Loguetown as their next stop on the way to the Grand Line.
• After arriving in Loguetown, Zero found Luffy near the harbor with Smoker and recognized the Marine captain.
• Zero warned Luffy that Smoker could turn into smoke and would be difficult to fight without properly learned Armament Haki.
• Zero followed Luffy toward the Pirate King’s execution site, where Luffy noticed Gol D. Roger.