Gold Roger, the Pirate King, had attained enormous wealth, fame, and power. Before he was executed, he announced to the crowd that he had left all his treasure at a certain place, causing the world to enter the Great Age of Pirates.
Eleven years later, the Red Hair Pirates came to a small port village named Foosha Village. After a year of them being there, a young boy named Monkey D. Luffy came to their ship to prove he was tough enough to join them by stabbing his face under his left eye. The pirates and Luffy then went to the bar, where the pirates toasted to Luffy's craziness as they ate and drank. Luffy tried to convince the captain, Red-Haired Shanks, to let him join the crew, but Shanks gently refused due to Luffy being too young and unable to swim.
The Gomu Gomu no Mi: a Devil Fruit that gives the eater the ability to stretch their body.
Suddenly, a group of mountain bandits led by Higuma entered the bar and demanded alcohol. The bartender Makino told them that the pirates had drank all of it already, and when Shanks offered Higuma the last bottle, he responded by breaking it over Shanks' head, not fearing the pirate due to his Beli.png8,000,000 bounty. Shanks simply responded by apologizing and cleaning up the mess, causing Higuma to break some more dishes before leaving with his gang. Afterwards, the Red Hair Pirates just laughed, but Luffy was angry at Shanks for not standing up for himself. He stormed out of the bar, and Shanks tried to grab his arm to hold him back, but to his shock Luffy kept walking as his arm stretched like rubber. The Red Hair Pirates then realized that the Devil Fruit they had stolen, the Gomu Gomu no Mi, was no longer in its chest, and Luffy confirmed that he had eaten it for dessert. Shanks revealed that Luffy's body was now made of rubber due to eating the Devil Fruit, and he would be unable to swim for the rest of his life.
Some time later, the Red Hair Pirates had gone off on another voyage, and Luffy was starting to have fun with his new rubber body. One day, however, he was sitting in Makino's bar when Higuma's gang returned and demanded alcohol. Soon afterwards, Makino alerted the mayor, Woop Slap, that Luffy had been kidnapped by the bandits after picking a fight with them. Higuma initially planned to sell Luffy to a circus due to his strange body, but then decided to kill him for angering him. However, Shanks and the Red Hair Pirates then returned, and when one of the bandits pointed his gun at Shanks, the pirate Lucky Roux shot him. Shanks stated that he could accept an insult toward him, but would not forgive anyone who harms his friends. His first mate Benn Beckman then overpowered the bandits singlehandedly, though Higuma managed to escape with Luffy in tow by throwing a smoke bomb. Higuma took Luffy out to sea and kicked him off the boat to drown him, and as Luffy struggled to stay afloat, a Sea King known as Lord of the Coast came to eat Higuma. It then moved to eat Luffy, but Shanks arrived in the nick of time to save Luffy and scare the beast away. Shanks was glad Luffy was okay, but Luffy was saddened that he had lost his arm in the process of saving him.
Later, the Red Hair Pirates were preparing to leave Foosha Village for good. Luffy had decided that he would not try to join them, and declared that he would form his own crew that would be stronger than Shanks', find the greatest treasure, and become Pirate King. To take Luffy up on his word, Shanks gave him his straw hat and told him to return it once he had surpassed him. As the Red Hair Pirates set sail, Shanks and Beckman both anticipated Luffy doing big things in the future.
Ten years later, Luffy set sail on his own in a small rowboat. The Lord of the Coast came to confront him, and he quickly took it out with Gomu Gomu no Pistol, where he stretched his arm forward and unleashed a long-range punch. As he drifted out to sea, Luffy plotted to recruit at least 10 crewmates, make a Jolly Roger, and become the Pirate King. However, he quickly ran into trouble as his boat was pulled into a whirlpool with no way of escaping.
Meanwhile, a pirate ship was docked at a remote island. The captain, Alvida, abused her subordinates for not working to clean the ship, especially the cabin boy Koby, whom she sent ashore to their base. Koby found a barrel that had washed ashore and rolled it to the wine cellar, and three of his crewmates, thinking the barrel had alcohol in it, decided to open it and drink in secret. To their shock, however, Luffy burst out of the barrel, having taken a nap inside it. The resulting commotion caused Alvida to throw her giant mace into the building and cause it to collapse, and her three henchmen told her about Koby bringing in Luffy as they had both escaped.
Luffy and Koby went into the nearby forest, and the former asked the latter if he had a small boat. Koby showed Luffy the small boat he had made himself in order to escape from Alvida after accidentally falling into her crew's clutches two years ago, but he let Luffy have it since he was too afraid to run away from Alvida. Luffy did not think much about Koby and his cowardice, saying he did not mind dying for the sake of achieving his dream of becoming the Pirate King and finding the One Piece. This caused Koby to contemplate making the effort to achieve his own dream of joining the Marines and arresting pirates like Alvida. Suddenly, Alvida and her crew came to confront Luffy and Koby as she destroyed the latter's boat. Alvida gave Koby the chance to stay alive by calling her the most beautiful in all the seas, but Luffy then insulted her offhandedly when asking Koby who she was. Koby initially started berating Luffy, but then remembered what he had told him and decided to stand up to Alvida and insult her instead. Alvida prepared to hit Koby with her mace, but an impressed Luffy then jumped in and intercepted the mace, with it not hurting him due to his rubber body. He then hit Alvida to the ground with Gomu Gomu no Pistol and told her crew to get Koby a boat, to which they quickly complied.
As they sailed away, Koby noted that for Luffy to achieve his dream he would have to enter the Grand Line, a place known as the pirate's graveyard. Luffy responded that he would form a powerful crew to survive it, and decided to recruit the bounty hunter and Marine prisoner Roronoa Zoro after hearing about him from the Alvida Pirates; this shocked Koby, who believed Zoro to be a demonic beast. Thanks to Koby's navigation skills, the duo were able to reach Shells Town, where the Marine base holding Zoro was stationed. Luffy and Koby ate at a restaurant before they intended to part ways, and the customers around them jumped when Luffy mentioned Zoro's name. Koby then recalled noticing that Captain Morgan was at this base, and to his surprise, the customers jumped again after hearing Morgan's name.
Luffy and Koby then walked up to the Marine base, and they found Zoro tied to a crucifix in the parade ground behind the outer wall. Zoro asked Luffy to free him, when suddenly a young girl named Rika climbed over the wall to feed him rice balls. However, Morgan's son Helmeppo then came in and took the rice balls, but then spit them out and stomped them into the ground due to them being sweet. He pointed out to the upset Rika that helping Zoro was a crime, and ordered one of the Marines accompanying him to throw her over the wall. The Marine did so reluctantly, and Luffy caught Rika. When Helmeppo's group had left, Luffy went into the parade ground to recruit Zoro. Zoro refused to become a pirate as he had his own agenda, revealing that Helmeppo had agreed to free him if he stayed here a month without food. However, he then asked Luffy to feed him the rice balls that Helmeppo had stomped into the ground; despite them being mixed with a large amount of dirt, he told Luffy to tell Rika they were delicious.
Luffy returned to Shells Town and told Rika this, to her delight. She revealed that Captain Morgan and Helmeppo ruled harshly over the town and had people put to death for little reason; Zoro had done nothing wrong, as he was arrested after saving her from one of Helmeppo's ferocious dogs. Helmeppo then came walking into town and ordered the citizens to bow down to him. He stated that Zoro would be executed in three days, causing Luffy to confront him over the promise he made. Helmeppo revealed that he was only joking about that, causing Luffy to punch him to the ground. Koby had to hold Luffy back from attacking him further, but Helmeppo promised to tell his father and get his revenge. As the citizens retreated into their homes, Luffy headed back to the Marine base to recruit Zoro again.
Luffy went back to Zoro, who once again refused to join his pirate crew. Luffy then wondered where Zoro's swords were, and he revealed that Helmeppo had taken them. Luffy decided to retrieve Zoro's swords and give them back if he joined him, much to Zoro's shock and ire. Inside the Marine base, Morgan asked a soldier why the citizens' tributes to him were growing smaller. The Marine replied that the town was growing poorer, but Morgan considered this to be a matter of their respect to him. Helmeppo then came and told Morgan to kill Luffy, but Morgan ignored this as he went up to the roof to oversee his men erect a massive statue of himself. Helmeppo asked why his father was not going after someone who attacked him, and Morgan responded that Helmeppo was old enough to fight his own battles; he only killed people who defied him. On that note, he inquired about Rika trespassing on the parade ground, and upon finding out that Helmeppo let her live, he ordered one of his men to kill her. When the soldier refused, Morgan struck him down with his giant axe hand. Meanwhile, Luffy was looking for someone to guide him to Zoro's swords and heard noises coming from the roof, so he stretched his arms to pull himself up there. His velocity resulted in him flying over the roof, so he grabbed onto the ropes the Marines were using to pull up Morgan's statue, causing the statue to fall down and split in two. Morgan was instantly furious and told his men to apprehend Luffy, and Luffy captured Helmeppo and took him inside the base to find out where Zoro's swords were.
Helmeppo told Luffy that he put Zoro's swords in his room, and when Luffy was confronted by some Marines, he used Helmeppo as a shield to protect himself. Luffy made his way into Helmeppo's room and saw three swords, but Helmeppo had fainted and so could not tell him which ones were Zoro's. As many of the Marines chased Luffy, one of them noticed Koby trying to free Zoro and told Morgan. Koby wished to be a proper sailor and stand up to the corrupt actions of this Marine base, and told Zoro that Luffy wanted to become the Pirate King. However, he was then shot in the shoulder by one of the Marines on the base roof. Zoro told Koby to escape before the Marines got down to them, but Koby revealed that Zoro's agreement with Helmeppo was a lie and that Luffy had punched Helmeppo after finding this out. He asked Zoro to help Luffy if he untied them, but Morgan and his troops then stormed the parade ground and held the two of them at gunpoint. Morgan ordered his men to shoot them, and Zoro grew worried as he had sworn to not die until he had fulfilled a promise.
When he was young, Zoro trained in a dojo and had lost in practice duels to Kuina, the dojo master Koushirou's daughter, 2000 times in a row. He was frustrated over his losing, and one night challenged Kuina to a duel with real swords. Kuina beat him again, and Zoro became even more frustrated, but she then revealed that she was frustrated too as she was entering puberty and her father had said that men would always eclipse women in strength. This made Zoro mad, as he wanted to beat her because he had worked hard rather than because of his gender. He and Kuina then made a promise with each other that they would each work to become the Greatest Swordsman in the World, and duel each other for the title. The next day, however, Zoro found out that Kuina had died after falling down the stairs. He asked Koushirou if he could have her sword, and emotionally declared that he would fulfill their promise for both of them and become the greatest swordsman possible.
In the present, as the Marines shot at Koby and Zoro, Luffy jumped out of the window and landed in front of them, causing the bullets to hit his body and ricochet back at the Marines. Luffy presented the swords to Zoro, who revealed that he wielded all three of them as a Santoryu user. With the Marines now unquestionably against him, Zoro decided to take up on Luffy's offer and become a pirate. The Marines then took out their swords and charged toward Luffy and Zoro, and Zoro told Luffy to give him his swords, allowing him to cut himself free and intercept all of the Marines at once. Luffy then hit all of the Marines with a stretched leg to knock them away. Morgan ordered his men to shoot themselves for their incompetence, and Luffy charged to fight him. Luffy quickly got the upper hand against Morgan, but Helmeppo then held Koby at gunpoint to stop Luffy from harming his father. Koby did not flinch in the face of death, and Luffy simply punched Helmeppo with Gomu Gomu no Pistol. Morgan rose back up to attack him from behind as he did this, but Zoro quickly cut him down. As Morgan and Helmeppo lay defeated, the Marines started celebrating.
Luffy, Zoro, and Koby went to Rika's mother's restaurant to eat, and Luffy and Zoro plotted to head for the Grand Line. Koby warned them against this as their friend, but thanked them for teaching him to stand up for himself. The Marines then came to the restaurant, and although they were grateful to the pirates for defeating their captain, they still asked for them to leave. Luffy and Zoro did so, and the Marines asked Koby if he was going with them. Luffy then started to tell them about Koby's history with Alvida, causing Koby to punch him. Luffy punched back and started a brawl, causing the Marines to believe they were not friends. As Luffy and Zoro left, Koby asked the Marines to let him enlist, promising to work any job. Although one soldier still did not trust him, the chief Marine accepted his request. As Luffy and Zoro set sail, Koby then arrived to salute them, and to his surprise he was joined by the rest of the Marines in thanking the pirates. Luffy told Koby they would meet again, and looked forward to heading for the Grand Line.