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Kaido’s ‘Joy Boy’ Statement Explained: What It Reveals About One Piece’s Biggest Mystery

By Ryota Ishizaki
· · Updated June 4, 2026 · 3 min read Full version →

The mystery of Joy Boy has been one of the most important long-running threads in One Piece, and Kaido’s cryptic statement during the Wano arc added a major new layer to it. During his final battle, Kaido suggests that the one who defeats him would be Joy Boy, hinting that he had been waiting for this legendary figure. This moment immediately sparked intense discussion among fans, especially after Luffy’s transformation in Gear 5.

Kaido’s words were not random, but deeply tied to the history of the Void Century and the legacy of the Kozuki clan. The statement connects Kaido’s personal beliefs, his past, and his understanding of the world’s hidden history. It also reframes Luffy’s victory as something much bigger than just defeating an Emperor. Let’s break down what Kaido meant, why Joy Boy matters, and what this reveals about the future of One Piece.

What Kaido Actually Said About Joy Boy

During his fight with Monkey D. Luffy, Kaido makes a striking remark that whoever defeats him will be Joy Boy. This line implies that Kaido had a specific expectation about the person capable of ending his reign. It also suggests that he believed Joy Boy would eventually appear to change the world.

This belief likely comes from Kaido’s past experiences and knowledge of ancient history. While the series has not fully revealed how much Kaido knows, it is clear he understands Joy Boy as a revolutionary figure. His statement shows that he saw his own defeat not as failure, but as confirmation that Joy Boy had finally arrived.

Luffy’s Gear 5 awakening confirms the return of Joy Boy in One Piece. (Image via Toei Animation)

Why Kaido Was Waiting for Joy Boy

Kaido’s obsession with strength and war is central to understanding his mindset. He believed that only a truly exceptional figure could defeat him, and he tied that expectation to Joy Boy. This explains why he constantly sought powerful opponents and pushed himself to the limit.

His connection with King also hints at this belief. In a flashback, Kaido tells King that Joy Boy would be the one to defeat him, reinforcing the idea that he had long been waiting for this moment. This reveals that Kaido viewed himself almost as a gatekeeper, testing whether anyone worthy of that title existed.

How Luffy’s Awakening Confirms the Truth

The turning point comes when Luffy awakens his Devil Fruit and unlocks Gear 5. At this moment, Zunesha declares that Joy Boy has returned, directly linking Luffy to the legendary figure. This confirmation transforms Kaido’s earlier statement into a prophecy fulfilled.

Luffy’s new form, tied to the Sun God Nika, represents freedom, joy, and liberation. These themes align perfectly with what little is known about Joy Boy’s role in history. Kaido’s defeat at the hands of Luffy completes this narrative, proving that the long-awaited figure has finally emerged in the present era.

Senior Staff Writer

Ryota Ishizaki is a junior writer and researcher supporting content production with data gathering, translation references, and fact-checking. He plays a key role in ensuring accuracy in coverage related to Japanese releases and original sources. His contributions help maintain reliability, particularly in news involving early announcements and regional developments.

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