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.

Luffy, Law, Kin’emon, and all the others are trying to infiltrate Kaido’s castle from all sides. Meanwhile, Big Mom’s children are climbing up the waterfall towards Onigashima again, but this time, Marco the Phoenix appears from nowhere and stands in their way!

The furious Big Mom chases Brachio Tank driven by Chopper and Usopp, but they bravely fight back! Meanwhile, Kanjuro takes the battered and bruised Momonosuke to Kaido and Orochi, then breaks the news to them about Oden’s retainers who were thought to be dead.

Luffy runs into Ulti and Page One, members of the Tobi Roppo from the Animal Kingdom Pirates. Hearing that he aims to become the King of the Pirates, the brother and sister duo become infuriated and turn themselves into massive beasts. When Luffy is driven into a corner, someone wearing a demon mask appears and whisks him away.

Evading Ulti and Page One, strong members of the Tobi Roppo, Luffy tries to find out what Kaido’s son Yamato’s motive is. However, the two get in a fight. Taking Luffy’s punishing attacks, Yamato remembers someone he fought against in the past.

The Akazaya members who were on board Law’s Polar Tang finally reach Onigashima and see someone who they didn’t expect. Kaido’s son Yamato starts telling his story to Luffy, shares his passion, and reveals what’s behind his mask!

At the back entrance of Onigashima, the Akazaya members try to get inside the gate, but they’re blocked by their former colleague Kanjuro. Meanwhile, as Kaido’s son Yamato shows Luffy the handcuffs that have restricted his freedom for years, they hear Kaido making a speech on his grand plan.

Kaido’s plan to obtain the great treasure infuriates Orochi, but his unexpected violent move silences everyone. Meanwhile at the back entrance of Onigashima, Kikunojo squares off against Kanjuro and gets into an emotional fight with her former colleague.

The Akazaya members start charging towards Kaido from the back of Onigashima. Meanwhile, at the Performance Floor, Kaido closes in on Momonosuke shivering in terror and asks him the ultimate question which will determine his fate.

The Akazaya members deliver a crushing blow to Kaido. Luffy and Yamato try to back them up, but Ulti stands in their way and Big Mom spots Luffy. Meanwhile, Nami and Carrot free themselves from their enemies and move on to take back Zeus!

The Animal Kingdom Pirates gasp with surprise to see thousands of samurai warriors coming into the castle. In his dragon form, Kaido goes outside to fight the Akazaya members under the moon. However, the Akazaya members have secret weapons to use against him

Shinobu tries to rescue the weakened Momonosuke but is found by King and attacked. On the other hand, Nami takes back Zeus from Big Mom and runs away but loses him again and gets chased by Zeus who is ordered to kill to her by Big Mom

Franky faces Big Mom with the help of Robin and Jimbei, but the Numbers come interrupting their battle. One of them holds Brachio Tank with Usopp and Chopper inside in his hand. Meanwhile, Yamato, the self-proclaimed Oden, finally meets his son Momonosuke.

As the Minks struggle with a poor hand against the Gifters, Kin’emon tries to assist them, but Dogstorm and Cat Viper stop him and start fighting for the other Minks! Meanwhile, Luffy and Zoro try to get to the rooftop to help Kin’emon and the others, but Queen and King get in their way.