It was a time when pirates ruled the seas. Several bands of pirates were battling over the great hidden treasure, One Piece, which was left by the now legendary pirate captain, Gold Roger. There was a young boy who admired the pirates, his name was Monkey D. Luffy. One day, he mistakenly eats the devil's fruit and turns himself into a rubber human being.
Ten years have passed since that incident. Luffy sets out to sail all alone. He sets out to become a great pirate captain and that's when his great adventure begins. "I'm going to be the Pirate King! I'm going to get One Piece!".
Whitebeard aims to take down the whole of Marineford and orders his crew and the other pirates to flee. Ace gives his final, grateful farewell to his captain before trying to escape as well. However, Akainu tauntingly mocks Whitebeard, and Ace, feeling angry and insulted on Whitebeard's behalf tries, to take him on. But it is quickly apparent that Ace is outmatched, and when Akainu aims to land a fatal blow on the now exhausted Luffy, Ace takes the hit for his younger brother instead.
Ace is punched by a magma fist through and through by Admiral Akainu, and falls into Luffy's arms. He then thinks about his past, and remembers his goal in life: To find out whether or not he had deserved to be born. Akainu proceeds to attack Luffy, but Jinbe stops his advance. Marco and Vista then rush to the aid of Luffy and strike Akainu with Haki imbued attacks, but realize they are ineffective against the Admiral. As everyone else stares in shock at Ace's wounds, they deduce that his organs were burned beyond help, and tell Luffy that Ace will not make it. Just as Ace dies, he thanks Luffy for everything and everyone for loving him. Luffy is then seen crying for the loss of his brother.
Luffy's mind collapsed due the emotional trauma when Ace died, so Jinbe takes him away. The Whitebeard Pirates and their Allies then vow to protect him. An enraged Whitebeard fights Akainu, having his torso pierced through once again, but still defeats the Logia user whilst starting the destruction of Marineford; splitting the ground between him and his sons. Surprisingly, the Blackbeard Pirates appear in Marineford, with their new crew members. Everyone stares in shock at the supposed Impel Down's Level 6 prisoners, as Blackbeard exclaims he's happy to have arrived on time to see Whitebeard's death.
Blackbeard and his pirates arrive in Marineford, as they are taken down from the execution platform by Whitebeard. In order to avenge his two sons (Ace and Thatch), Whitebeard fights Blackbeard. Even with Blackbeard's powers to cancel Devil Fruit abilities, Whitebeard deals a critical blow with his bisento, and then proceeds to pin Blackbeard down, grabs him by the throat, and uses his devil fruit to crush him and throw him back.Teach still survives, and with his crew, all cowardly attack Whitebeard. In his final moments, Whitebeard remembers his last meeting with Roger and his path as a pirate in order to have his family. Whitebeard dies standing, right after telling Blackbeard that he is not the one Roger is waiting for, saying that the will of people liike Ace will not die and there will be one that will challenge the world in the future, and then teeling the world that One Piece is real.
The death of Edward Newgate is already in the progress of being known, all over the world. Silvers Rayleigh too, heard the news. At Marineford, Teach starts his plan, and his crew covers up Teach and Newgate's corpse. The scene changes to Jinbe, who is trying to save Luffy. He flashes back, as he is informed by Vista that he needs to hurry. Down below the cliff, Akainu is getting back up, continuing his chase of Strawhat. Finally being above surface, Akainu is stopped from getting after Luffy by Ivankov and Inazuma. They can hold their ground, but Akainu won't let Luffy get away. Back at the Blackbeard Pirates, they lift the black cloth and Teach shows his darkness powers and his newly gained earthquake powers. Everybody is shocked, and Blackbeard lets everyone: Marineford, pirates, and peace-loving civillians know that this is his era!
Blackbeard declares he will destroy all of Marineford as the disheartened marines watches him, frightened and worried. When suddenly Sengoku blasts Blackbeard and his crew with a shock wave from his palm, and delivers a rousing speech to raise the marines' spirits again. The marines attack Whitebeard pirates that are left behind, and Coby is confused about the Justice of killing pirates after the Navy has clearly won the war. Meanwhile, Akainu relentlessly continues to pursue Luffy and Jinbe, harming both severely in the process. Before both are killed, Crocodile interferes, as do the other Whitebeard Commanders and pirates. Buggy catches the thrown Jinbe and Luffy unsure of where to go and what to do, when Trafalgar Law arrives at the scene saying to bring Luffy to him, as he is a doctor.
The fight in Marineford still rages on, as Trafalgar Law arrives to rescue Luffy. Sengoku still fights Blackbeard, while Akainu fights the commanders of the Whitebeard Pirates. Even though the Marines clearly won the war, they still fight, and while many die around Coby, the "voices" continue to fade away from his mind. For a few moments he bravely stops the war, and as he's about to be killed by Akainu, Shanks arrives, claiming that those "seconds of courage have changed the fate of the world".
Law and his crew take Jinbe and Luffy inside their submarine. As they're both put on the operation table, Buggy yells at Shanks for lying about the treasure map. When Buggy is cooled down and praised by his followers, Shanks threatens Blackbeard. As both crews face down each other, Teach's side decides to leave. Shanks then declares that Ace's and Whitebeard's dead bodies should be given a proper burial by the pirates. Sengoku agrees and the war ends.
As Luffy's fate hangs in the balance, word spreads that the war is over and people all over the world rejoice on the news of the Marines' victory. However, behind all the celebrations and cheers, there are new troubles on the horizon. Blackbeard is on the move with his new crew members from Impel Down's level 6. Upon Whitebeard's death, the world's balance has crumbled. Also, with his last words confirming the existence of One Piece, pirates all over the world are simmering at the brim.
Brownbeard is seen taking over Foodvalten saying it isn't a Whitebeard territory anymore, Iva says goodbye to Jinbe and the others. Boa Hancock, the Heart Pirates, and Jinbe make it to Amazon Lily. Luffy wakes up and goes on a rampage on the eastern shore looking for Ace. He later understands that Ace is no longer alive while talking to Jinbe.
After eating the Hungrila Bird that they captured, Luffy and Toriko team up again to save Nami and Komatsu who have been kidnapped by the Cocoalas.
Garp drops Luffy to live with the Dadan Family where he meets Ace - who immediately dislikes Luffy. Luffy follows Ace to become friend with him every day continuously for 3 months, while Ace attempts to discourage Luffy by leading him through hazardous obstacles like rivers filled with crocodiles. At the end of the 3 months, Luffy reaches the end of the forest and discovers a new place on Dawn Island - the Gray Terminal.
Luffy discovers that at the end of the forest is a slum dumpster named Gray Terminal, a lawless area full of homeless people. While Luffy searches for Ace, Ace attacks two men carrying treasure and robs them. Luffy then sees Ace running towards the forest to meet Sabo and follows after him. He ends up discovering their secret stash, much to the two older boys' panic. Luffy gets captured by the crew who’s loot Ace stole when Luffy is asked where the money and valuables are, he tries to lie unconvincingly. Soon Sabo figures out that Luffy won't ever tell Porchemy. And so he and Ace run to Luffy's rescue.
Ace and Sabo rescue Luffy from Porchemy by defeating him. Bluejam is mad at Porchemy for his failure and kills him. Luffy finally start to get along with Ace and Sabo. Sabo decides to stay at Mt. Corvo with the Dadan Family.
Sabo is seen by his father but Sabo pretends he doesn't know him. Later Sabo explains to Ace and Luffy that he is in fact a Noble. Ace, Sabo, and Luffy become brothers by sharing a drink together.
Faced with Dadan’s growing impatience, Luffy, Ace and Sabo decide to strike out on their own and build a hideout for themselves in order to continue pursuing their dreams of being pirates.
Ace, Sabo, and Luffy chase down a Danpa and succeeds to catch it, but a tiger steals it. To get revenge, the three brothers put fish on their back to lure the tiger, but a bear that can match the tiger appears. Ace attacks the bear, but it gets angry and chases the three brothers. It is then stopped by a former pirate captain named Naguri using Haki.
Ace, Sabo and Luffy help Naguri make a pirate ship. The three brothers meet the tiger they fought the previous episode. The three brother defeats the tiger and say good-bye to Naguri. The episode ends with Bluejam telling his crew to tell Sabo's father that they have found Sabo.
Sabo, Luffy and Ace are caught by the Bluejam Pirates. Sabo returns to High Town and finds out about the nobles' plan to burn "all the shame" in Gray Terminal from the new brother his parents adopted when he ran away. Sabo runs away to warn Luffy and Ace.
Sabo failed to warn his brothers. A huge fire engulfs Gray Terminal. Ace and Luffy try to escape but find themselves struggling against the Bluejam Pirates.
While Dadan and Ace stay behind to fight Bluejam, the rest of the Dadan Family and Luffy make a quick escape. In the mean time Sabo fully accepts that he will never have freedom so long as he stays in Goa and leaves the island the day the Celestial Dragon are set to arrive.
Sabo's ship is destroyed by a Celestial Dragon. Ace and Dadan return to the bandits house to the relief of Luffy and of the other bandits. Dogra returns from town and informs them about Sabo's death. Later Ace receives a letter from Sabo, that was written before he set out to sea. The letter told Ace to take care of Luffy.
Ace starts to care for Luffy more as a brother after he was nearly mauled to death by a bear. Ace then sets off on his own 7 years later, bidding the moutain bandits and Luffy farewell. Dogra comes by a few months later and shows Luffy a newspaper that talks about Ace and his new crew. 3 Years later, Luffy sets out from the Goa kingdom. He then beats up the local sea monster for eating Shank's arm and to show the results of his forest training. Present time: Luffy proclaims that he is weak in front of Jinbe (and possibly the whole island), implying that he can't be the king of pirates like he wanted, considering that he wasn't able to protect Ace or his friends.
At Windmill Village, Garp visits Dadan and the mountain bandit fights the Vice Admiral. Makino stops Dadan and tells her that Luffy is suffering as a result of Ace's death. When the Mayor asks about Luffy, Dadan screams at Luffy, telling him not to be defeated. Meanwhile, at the New World, a funeral is held for Ace and Whitebeard. Shanks mourns the loss of his friends before he departs from the New World. At Amazon Lily, Luffy is still distraught because of Ace's death. Jimbei tells Luffy not to blame Ace for his actions. Enraged, Luffy tries to fight Jimbei, but the fishman easily defeats him. When Jimbei queries about what Luffy still has left, Luffy tells Jimbei that he wants to see his crew.
On Kuraigana Island, Zoro confronts and nearly defeated by several Humandrills, but is stopped by Mihawk. On Birdie Kingdom, Chopper is captured by a human tribe and attempts to escape, but is stopped by the giant birds. Eventually, the tribe befriends the birds and Chopper before he receives the newspaper about Ace's fate. On Weatheria, Nami is working hard labor when she also receives the newspaper. On the Bowin Island, Usopp has become overweight despite Heracles' objections and knocks down a News Coo with a newspaper. On Kamabakka Kingdom, Sanji has become a crossdresser and watches the sunset; he receives the newspaper and becomes horrified about Ace's death. On Tequila Wolf, Robin decides to see her friends. Meanwhile, on Baldimore, Franky remembers that he defeated a mechanical polar bear after finding a stash of cola, before a fax machine prints out a newspaper about Ace's death. At Hungaria, Brook is writing music for the Longarm Tribe when he loses his concentration and discovers Ace's death. Back on Kuraigana Island, Zoro tells Mihawk that Kuma teleported him, and Mihawk informs Zoro of Ace's death.
On Maiden Island, Rayleigh kills a Sea King and arrives on the island in front of Law's crew. Meanwhile, at Amazon Lily, Hancock is contemplating about marriage when Jimbei and Luffy meet the Dark King, who tells that Law has left the island with his crew. Rayleigh gives back Luffy's straw hat and befriends the Snake Princess and her sisters.Rayleigh tells Hancock that Kuma he would sent Luffy to Amazon Lily just before he teleported the Straw Hat crew away. However, Rayleigh cannot bring Luffy back to the Sabaody Archipelago, as he would suffer the same fate on the island. He gives Luffy an offer to be trained. Meanwhile, at the Bowin Islands, an overweight Usopp desperately tries to escape and fight despite Heracles' objections. Usopp gets sucked into the island's mouth and is rescued by Heracles. Usopp makes a vow to Heracles that he will not abandon Luffy.
At Amazon Lily, Luffy is trying to make up his mind regarding Rayleigh's offer, as he made a promise to his crew to meet in three days. On Weatheria, Nami attempts to flee from the island by stealing a local balloon, but it crashes and Nami is captured by the townspeople as a traitor. After Nami bursts into tears while talking about Luffy's failure to save Ace, she flees with Haredas and is eventually chased by the townspeople yet again. Meanwhile, on Karakuri Island, Franky asks Kitton to use his ship, only to be rejected. When he is told that there is an ice breaker developed in Dr. Vegapunk's laboratory, he finds the laboratory and is chased by the Marines. Franky discovers blueprints and a button with a pirate mark. When he pushes the button, it explodes, destroying the laboratory and seemingly killing Franky.
On Kuraigana Island, Zoro tries to use Mihawk's boat to escape but is stopped by the humandrills. He also discovers that the humandrills have used Zoro's techniques. Mihawk tells Zoro that humandrills have used their behavior while watching other humans and tells Zoro to rest, but confronts the humandrills. Meanwhile, on Namakura Island, the shamans mistake Brook's music scores as talismans against the Longarm tribe. The Longarms confront the shamans of the island; however, Brook reveals that the talismans are music. After playing a song, the shamans capture some of the tribe members. When Brook tells the shamans to release the Longarms, the tribe captures the skeletal musician. On Amazon Lily, Luffy finally makes up his mind and decides to go back to Marineford.
Jimbei and Luffy hijack a Marine ship and enter Marineford again using the Gates of Justice. At the Birdie Kingdom, the local tribe gives Chopper a basket of fruit and cotton candy. Chopper eventually flies off with one of the kingdom's birds and discovers a newspaper, much to his horror. Meanwhile, on the East Blue's bridge, Robin is given a photograph and the Revolutionaries offer her to meet with the leader, as she is the only survivor of Ohara. Robin is given a newspaper, informing her that Luffy is alive and learns about what is going on. On Kamabakka Kingdom, Ivankov returns to the kingdom. Sanji confronts Ivankov, and is informed about what happened to his crew. Sanji and Ivankov fight each other and Ivankov defeats him with the Death Wink, Hell Wink and Galaxy Wink techniques. Sanji is horrified to learn about Luffy's recent involvement. At Baltigo, Ivankov informs Dragon about Luffy's escape. Dragon tells Ivankov about what happened to Kuma, and is told that Luffy has made it to Marineford.
Luffy finally arrives at Marineford along with Rayleigh and Jimbei. Luffy uses the Gum-Gum Whip technique on the Marines, allowing him to reach the Ox Bell - ringing it 16 times to signify the end of the war. Luffy follows the reporters and throws a bouquet of flowers. The reporters take Luffy's pictures, along with his tattoo. Luffy, Jimbei and Rayleigh leave Marineford. Meanwhile, the Five Elders discuss their plans to fill the three remaining Warlord positions with powerful warriors. At the New World, Sengoku resigns from his position. Back at Marineford, Coby decides to get stronger. Meanwhile, Kidd hears of Luffy's recent involvement in Marineford. In the open sea, Capone's ship gets sucked into a vortex, Basil challenges Brownbeard while reading the news and Urouge discovers an island with thunderstorms. Kidd uses his Devil Fruit powers to defeat the pirates, and vows to defeat Luffy.
Buggy tearfully reunites with his crew on an unknown island. Alvida discovers a treasure mark from which Luffy found in Impel Down. Mr. 3 delivers a message from the World Government to Buggy. At the Sabaody Archipelago, Duval and the Flying Fish Riders confront the Copper Pirates. Shakky, Camie, Hatchan and Pappag entrust the protection of the ship to Duval. Eventually, the pirates confront Kuma and the World Government. At Alabasta, Cobra, Chaka and Koza learn they have problems with the pirates. However, Igaram tells them that Vivi and Karoo were excited that Luffy has survived. On another unknown island, Crocodile and Mr. 1 read the news on Luffy's involvement, and decide to return to the New World. Chopper flies on a bird when he receives Luffy's message. Robin travels to the East Blue and receives Luffy's message. On Kamabakka Kingdom, Sanji and Ivankov receive the news on Luffy's involvement. Usopp tries to escape Bowin Island when he and Heracles receive the news. On Weatheria, Nami and Haredas receives Luffy's message while trying to escape. Franky, having survived the explosion at Karakuri Island, also receives the news. Brook is caged by the local tribes when he receives the news. On Kuraigana Island, Zoro and Perona eventually learn about Luffy's message.
Near the Sabaody Archipelago, Law and his crew decide to wait for the proper moment to enter the New World. On a winter island, X. Drake confronts Kaido's security guard to enter a town. Meanwhile, on a local spring island, Apoo runs on an invisible road to the sky. At a burning island, Blackbeard defeats Bonney and abandons her to be captured by Akainu. At Marie Jois, Doflamingo tells a government official that he seemingly killed Moria while in Marineford. However, Doflamingo does not care about the World Government's powers, as he is still a pirate. On Birdie Kingdom, Chopper, ashamed for returning too soon, dons a disguise. After being allowed to stay on the island to study the local medical plants, Chopper makes a tearful vow to Luffy that he will train intensively.
On Weatheria, Nami is cornered by the scientists again. However, the navigator apologizes and takes off her shoes before luring the scientists to the edge of a cliff, allowing Nami to stay on the island. Nami requests Haredas to teach her the weather of the New World, as she wants to help Luffy on his journey to become King of the Pirates. The navigator also requests that she will use the Weather Balls as weapons. Meanwhile, on Kurakiri Island, the Marines investigate the lab's destruction. Franky learns about Vegapunk's inventions and uses a tiger mat as a cover for his head. Franky tells his friends about his dream and decides to help his captain by acquiring new skills learned from Dr. Vegapunk's inventions. When his mat is burned, the shipwright scares off the Marines. On Kamabakka Kingdom, Sanji learns from Ivankov that eating helps his body to become aggressive. Despite Ivankov's refusal to teach the dish of aggression, Sanji declines his offer to use Newkama Kempo, as he is a man who likes ladies. Ivankov offers the cook to hand out the recipes to the 99 Grand Master chefs on the island, which Sanji finally accepts and fights the Newkamas.
A group of people are gathered to see some kind of freak show. Robin and the revolutionaries question Brook as to why she suddenly changed her mind and decided to come with them to Baltigo. Usopp is running with Heracles telling him that he needs to lose weight and get much stronger. Zoro meanwhile is begging Mihawk to train him to become a great swordsman.
On a deserted island north west of the Amazon Lily is Rusukaina, this will be Luffy's training spot for the next two years. Hancock, Luffy and Rayleigh discuss the merits of training on the island