The Raid on Onigashima became one of the largest and most important conflicts in One Piece history. More than just another arc-ending battle, the Onigashima War completely changed the balance of power in the pirate world, ended Kaido’s reign over Wano, and pushed Monkey D. Luffy closer than ever to becoming the Pirate King. It also delivered some of the series’ biggest revelations, including Gear 5, Joy Boy references, and the fall of two Emperors of the Sea.
For years, the Wano Country Arc slowly built toward this massive confrontation. Kaido and Orochi had ruled Wano through violence, slavery, and fear for over two decades. Factories polluted the land, citizens starved, and anyone who opposed the regime was crushed. The Raid on Onigashima was the culmination of a twenty-year rebellion tied directly to Kozuki Oden’s legacy and the dreams of the samurai who survived his execution.
What made the war especially important was its scale. Nearly every major faction in Wano participated, including the Straw Hats, the Nine Red Scabbards, the Worst Generation captains, the Mink Tribe, and Kaido’s Beast Pirates. By the time the fighting ended, the entire future of One Piece had changed forever.
Why the Raid on Onigashima Happened
The Onigashima raid was launched to overthrow Kaidou and free Wano Country from the combined tyranny of the Beast Pirates and the Kurozumi Family. Twenty years before the raid, Kaido allied with Kurozumi Orochi to seize control of Wano after the death of Kozuki Oden.
Oden’s execution became one of the most important moments in Wano’s history. Before dying, he inspired his retainers, later known as the Nine Red Scabbards, to continue fighting for Wano’s freedom. Some of them were even sent twenty years into the future by Oden’s wife, Toki, allowing them to carry on his will in the present timeline.
After arriving in Wano, Monkey D. Luffy formed an alliance with the samurai, the Mink Tribe, and other pirate crews like those led by Trafalgar D. Water Law and Eustass Kid. Their goal was to launch a surprise attack during the Fire Festival while Kaido’s forces were distracted.
The timing became even more urgent after Kaido announced the “New Onigashima Project,” a plan to transform Wano into a pirate stronghold ruled entirely by force. He also declared his intention to join forces with Charlotte Linlin, better known as Big Mom, creating a terrifying alliance between two Yonko. That alliance raised the stakes higher than ever before in the New World.
The Alliance vs the Beast Pirates
The Raid on Onigashima began as a stealth invasion but quickly escalated into full-scale war. The Ninja-Pirate-Mink-Samurai Alliance attacked Kaido’s forces inside Onigashima while the Fire Festival was underway. According to official information from the One Piece Wiki, the enemy forces included roughly 30,000 members tied to Kaido, Orochi, and their allies.
Early in the raid, the Nine Red Scabbards confronted Kaido directly in one of the arc’s most emotional battles. Their attack mirrored Oden’s final assault against Kaido years earlier, symbolizing their refusal to let Oden’s will die. Although the Scabbards managed to wound Kaido temporarily, they were ultimately overwhelmed by his immense strength.
The war then split into dozens of simultaneous battles across Onigashima. Each Straw Hat received a major fight against members of the Beast Pirates, especially Kaido’s top commanders known as the All-Stars and the Tobi Roppo.
Roronoa Zoro and Sanji fought King and Queen in two of the arc’s biggest matchups. Zoro unlocked advanced Conqueror’s Haki during his fight against King, while Sanji fully awakened the genetic enhancements connected to Germa 66. These battles pushed both characters into completely new power levels.
Meanwhile, other Straw Hats like Nico Robin, Franky, and Jinbe received major victories against the Tobi Roppo, proving that the Straw Hat crew had evolved into a force capable of challenging an Emperor’s army.
The war also highlighted how deeply Wano’s citizens suffered under Kaido’s rule. The factories, forced labor camps, polluted water, and starvation throughout Wano gave emotional weight to the rebellion.
The Rooftop Battle Changed Everything
One of the defining moments of the Onigashima War was the rooftop battle between the Worst Generation captains and the two Yonko. Luffy, Zoro, Law, Kid, and Killer faced Kaido and Big Mom together in a fight that many fans consider one of the greatest battles in One Piece history.
This fight completely changed how readers viewed the new generation of pirates. Before Wano, the Yonko felt nearly untouchable. During the rooftop battle, the Worst Generation finally proved they could challenge the old era directly.
Luffy especially evolved dramatically during this fight. After initially being defeated multiple times by Kaido, he gradually learned advanced forms of Haki, including advanced Conqueror’s Haki coating. Kaido himself acknowledged Luffy as a worthy opponent, something very few characters had ever achieved.
Zoro also surprised fans during the battle by scarring Kaido using Enma, the legendary sword once wielded by Oden. This moment reinforced the parallels between Zoro and Wano’s samurai legacy.
At the same time, Law and Kid eventually separated Big Mom from Kaido and fought her independently. Their eventual victory over Big Mom marked the first time one of the Four Emperors had been decisively defeated in the modern timeline of One Piece.
The rooftop battle symbolized the rise of the new pirate era and the decline of the old generation that once dominated the seas.
Gear 5 and Joy Boy’s Return
The single biggest turning point of the Onigashima War came when Luffy awakened Gear 5 during his final battle against Kaido. After being seemingly defeated, Luffy’s Devil Fruit awakened and revealed one of the most surprising twists in One Piece history.
The World Government confirmed that Luffy’s fruit was not actually the Gum-Gum Fruit. Its real identity was the Human-Human Fruit, Model: Nika, a mythical Zoan tied to the legendary Sun God Nika.
This revelation completely changed the lore surrounding Luffy’s powers. Gear 5 gave him cartoon-like freedom in combat, allowing him to manipulate his surroundings and fight with unprecedented creativity. More importantly, the awakening connected Luffy to the ancient figure Joy Boy, whose return had been foreshadowed throughout the series.
Kaido recognized the significance of this transformation immediately. Their final battle became more than just a pirate fight. It represented the clash between oppression and liberation, themes that have defined One Piece from the beginning.
Gear 5 also changed the tone of combat in One Piece. The transformation embraced the series’ exaggerated and comedic style while still delivering one of the most visually explosive fights in the franchise. By defeating Kaido, Luffy accomplished something the world believed impossible.
The Fall of Kaido and Big Mom Changed the World
The aftermath of the Onigashima War had consequences far beyond Wano. Kaido and Big Mom, two of the most feared Emperors in the world, were both defeated during the same conflict. This completely destabilized the balance of power across the seas.
Following the battle, Luffy was officially recognized as one of the new Four Emperors. His rise signaled that the era dominated by older legends like Kaido and Big Mom was ending.
Wano itself was finally liberated after decades of suffering. Kozuki Momonosuke became the new shogun, restoring the Kozuki Family to power and fulfilling Oden’s dream of freeing the country.
The war also reshaped several individual characters. Yamato rejected Kaido’s ideology and chose to carry on Oden’s will instead. Kid and Law gained global recognition after helping defeat Big Mom. The Straw Hats further cemented themselves as one of the strongest crews in the world.
Perhaps most importantly, the World Government became increasingly alarmed by Luffy’s growing influence and the return of Joy Boy symbolism. The events in Wano directly pushed the story into the Final Saga, where the true history of the world and the meaning of the One Piece treasure are finally beginning to emerge.
Why the Onigashima War Was a Turning Point for One Piece
The Onigashima War mattered because it represented the payoff to years of storytelling stretching back across multiple arcs. Plotlines connected to Punk Hazard, Dressrosa, Zou, and Whole Cake Island all converged during the battle for Wano.
It also marked the moment when the Straw Hats fully entered the top tier of the pirate world. Before Wano, they were still viewed as dangerous rookies challenging stronger powers. After Onigashima, they became one of the dominant forces shaping the future of the seas.
The war further expanded the themes of inherited will and liberation that define One Piece. Oden’s dream survived through the Scabbards, Momonosuke, and eventually Luffy himself. Kaido represented a brutal world ruled by strength and despair, while Luffy embodied freedom and hope.
Even the structure of the arc reflected this thematic clash. The raid constantly emphasized people carrying the wills of previous generations, from Yamato idolizing Oden to Zoro inheriting Enma and Luffy becoming connected to Joy Boy.
The scale of the conflict also rivaled Marineford in importance. Many fans compare the two wars because both reshaped the entire One Piece world. However, while Marineford represented the end of one era, Onigashima represented the birth of another.
The Onigashima Raid Pushed One Piece Into Its Final Era
By the end of the Wano Arc, One Piece no longer felt like the same story that began in East Blue decades earlier. The fall of Kaido, the awakening of Gear 5, the emergence of Joy Boy themes, and the rise of Luffy as an Emperor all pushed the series into its final stage.
The Raid on Onigashima was not just a battle against Kaido. It was the moment the old world started collapsing. Ancient mysteries, forgotten history, and long-hidden truths began moving to the center of the story after Wano’s conclusion.
For many fans, the arc represented the peak of One Piece’s modern storytelling because of its emotional stakes, massive scale, and lasting consequences. The war changed Wano forever, transformed the Straw Hats’ status in the world, and set the stage for the Final Saga that Eiichiro Oda had been building toward for years. Most importantly, it proved that the new generation had finally arrived.
