One Piece
The Ninja-Pirate-Mink-Samurai Alliance gather their forces in Wano Country and prepare for their inevitable clash against the Beasts Pirates. The history of Kozuki Oden and his ties to Wano Country, Whitebeard and Gol D. Roger are revealed, and the Alliance assaults Onigashima to take down the allied forces of Kaidou and Big Mom once and for all. The resulting battle, as well as the events during the recent Levely, cause the world to go through dramatic changes.
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Toki tends to Oden after he rescued her from the kidnappers. On the next day, they are confronted by the kidnappers and their leader, Karma. Whitebeard intervenes and knocks out Karma. Whitebeard accepts Oden into his crew because of his selflessness.
Orochi plots to take the shogunate with Higurashi's assistance. As Oden continues his journey with the Whitebeard Pirates, he finally encounters the Roger Pirates. A clash between Edward Newgate and Gol D. Roger ensues.
Roger is amazed when he finds out that Oden can read the script on the Ponegliff since he believes it will guide him to the last, undiscovered island where no man has ever been. Roger begs Whitebeard for permission to take Oden with him on a one-year journey. But Oden gives it some thought and speaks his mind as well!
Singing out loud, the Roger Pirates continue on with their journey. They soar up to the island above the clouds and go down into the deep sea to get to the island at the sea bottom. Oden deciphers the Ponegliffs on those islands for Roger who believes those inscriptions will tell them the location of the last island on the Grand Line.
Oden and the Roger Pirates head for the Land of Wano to obtain a copy of the Road Ponegliff. Oden sees Kin’emon and the others for the first time in years, but he immediately returns to the sea leaving his wife and children behind. Then, after stopping by at the Mokomo Dukedom and getting a copy of the last Road Ponegliff, the Roger Pirates finally make it to the last island.
After reaching Laugh Tale, Roger declares the disbanding of his pirate group and disembarks first. Oden gets dropped off at the Land of Wano and reunites with his family and retainers. Later, he hears that Orochi took over the country with the help of a strong pirate named Kaido after the Shogun Sukiyaki’s death and becomes enraged by stories of his tyrannical acts.
Enraged by Orochi’s tyrannical acts, Oden raids his castle in the Flower Capital and points his sword at Orochi. However, hours later, people who were waiting for Oden to come out after defeating Orochi see the unexpected. Meanwhile, the King of the Pirates Roger’s execution and last words are printed in newspapers and spread across the world.
Oden keeps dancing naked in the Flower Capital and losing all the trust of the people. One day, Orochi comes to Kuri and reveals his evil plan for the Land of Wano as well as his brutalities against the country’s mobster and Oden’s friend, Hyogoro and his wife. Despairing and in a rage, Oden finally decides to take down Orochi’s supporter, Kaido.
Kaido comes to the mainland along with his troops to fight against Oden and the Akazaya samurai who were on their way to raid Kaido’s mansion. Even though Oden’s group are unprepared and outnumbered, they fight hard to save the future of the Land of Wano.
Oden and the Akazaya members are sentenced to death by boiling in a pot. Oden asks for a chance to survive which is accepted by Kaido. Then, Oden enters the boiling pot holding his retainers over his head. Shinobu watches from among the spectators and reveals what Oden had been doing to save the country, to the surprise of the citizens.
As Oden continues trying to survive in the boiling pot holding his retainers over his head, people learn the truth from Shinobu and get shocked. At the same time, Oden tells his retainers the importance of opening the borders of the Land of Wano. Time ticks down for Oden and his clan’s freedom.
As Kin’emon and the others run to Oden Castle to save Oden’s family, the castle is set on fire and Kaido attacks Toki and her children. Leaving Momonosuke to Kin’emon and Hiyori to Kawamatsu, Toki appears in front of the desperate people of the Land of Wano and gives a prophecy.
After 20 years since Oden Castle burned down, Oden’s surviving retainers are working hard separately at their own missions, believing in Toki’s prophecy. The day of the Fire Festival has finally come and the whole army is now getting ready to head for Onigashima to raid Kaido!
The Straw Hats and thousands of allies who were supposed to be there are nowhere to be found, but Kin’emon and the others decide to set sail to the stormy sea in a small boat. Kaido’s army that appears out of nowhere and a betrayal drive the Akazaya members into a corner.
Luffy, Law, and Kid join the Akazaya samurai and begin to fight Kaido’s army. The three rivals from the Worst Generation compete with each other as they attack the enemy fleet with their ultimate skills. When it seems like they gain upper hand in the battle, another strong enemy appears to help Kaido’s army.
The Akazaya members are surprised by help from their old mate and Kin’emon notices he made a big mistake which has luckily saved all his allies. As their battle against Kaido’s army heats up, the cornered Kanjuro makes a stunning move.
Swept away by Kanjuro, Momonosuke remembers his father, tries to rise above his fear, and speak to his allies. Luffy and the others start heading for Onigashima, but Kaido’s army gets in their way again with a formidable weapon. However, a surprising figure comes to help the cornered Straw Hats.
Luffy and the rest of the Straw Hat crew are excited to see Jimbei again and welcome him as a new member. Meanwhile, Law and the Akazaya members strategize on how to enter Onigashima and attack Kaido. As the Straw Hats approach the giant torii gate in front of Onigashima, they are attacked out of the blue.
To Law and the others’ surprise, Luffy and the rest of the Straw Hats attack the giant torii gate in front of Onigashima. Meanwhile, Kaido and Orochi are having a big banquet on the island where Kaido’s formidable subordinates, the Tobi Roppo, are called in.
The Straw Hats and the samurai warriors finally reach Onigashima! Before they set out for the castle as they planned, the samurai warriors use surprising but determined tactics to cut off their retreat which leave the Straw Hats in shock.
Eustass Kid and his clan start heading for Kaido's castle head on waving Luffy off. Luffy and Zoro go after them to stop them from causing trouble, but they happen to step into Kaido’s banquet. Meanwhile, Kanjuro loses his way to Kaido in underground passages with Momonosuke who he kidnapped in tow.
Luffy and Zoro each witness Kaido’s subordinates waste food at the banquet and make fun of the poor people in the Land of Wano. Thinking of Otama, a small girl who liked red-bean soup so much, both Luffy and Zoro become infuriated and create turmoil.
After making a scene at the Golden Festival, Luffy and Zoro try to get away, but Queen announces to his subordinates that anyone who catches them will be rewarded with a position in the Tobi Roppo. Scratchmen Apoo stands in Luffy and Zoro’s way and with his ability to use music as a weapon, he launches unpredictable attacks which corner Luffy and Zoro.
Haccha, a supergiant Number, joins in and the pursuit of Luffy and the others becomes even more intense. Meanwhile, Kin’emon changes his strategy and his group tries to infiltrate the castle from its side, but there is an unexpected change of the floor plan which coincidentally makes Sanji excited.