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One Piece: Pirate Warriors 4
Japanese cover art
Developer(s)	Omega Force
Publisher(s)	Bandai Namco Entertainment
Director(s)	Hideo Suzuki
Producer(s)	Katsuaki Tsuzuki Akihiro Suzuki Hisashi Koinuma
Composer(s)	Satoshi Seki[1]
Series	One Piece: Pirate Warriors (One Piece)
Platform(s)	Nintendo Switch PlayStation 4 Windows Xbox One PlayStation 5 Xbox Series X/S Nintendo Switch 2
Release	PS4, Nintendo Switch, Xbox One, Windows WW: March 27, 2020 PS5, Xbox Series X/S WW: TBA Nintendo Switch 2 WW: Fall 2025
Genre(s)	Hack and slash
Mode(s)	Single-player, multiplayer

One Piece: Pirate Warriors 4^[a] is a 2020 hack and slash video game developed by Koei Tecmo‘s Omega Force and published by Bandai Namco Entertainment. It was released for the Nintendo Switch, PlayStation 4, Windows, and Xbox One on March 27, 2020. It is the fourth installment in the Pirate Warriors sub-series, based on the One Piece franchise and Koei Tecmo’s Dynasty Warriors series. It was released on March 27, 2020.^[2]

The game features game play similar to the previous installments.^[3] The game has its own original story that takes the Wano arc from One Piece and changes it.^[4] It also features four new multiplayer modes called Giant Boss Battle, Total Bounty Battle, Timed Defense Battle, and Territory Battle.^[5]

This story adapts numerous story arcs from the original manga series, but the plot of the Wano Country arc was modified significantly due to its incompletion at the time of its release. Cavendish, Bartolomeo, Sabo, Smoker, Tashigi and Kuzan appear in the arc to help the Straw Hats to free Luffy from his cell. As the battle intensifies between Big Mom and Kaido, a new enemy appears in the form of Blackbeard and his crew. Fighting Blackbeard, Big Mom, and Kaido’s crew, players are met with a final battle against Kaido who turns into a dragon after defeating Big Mom, Blackbeard, and Kaido’s underlings. Luffy defeats Kaido at the end, prompting him to flee the country in revenge while everyone cheers and celebrates Luffy’s victory.^[6]

61 characters are playable in the game, 43 of which are base-game characters, while 18 additional characters were added later via DLC.^[7] Previously playable characters Bartholomew Kuma, Caesar Clown, Gecko Moria, Magellan, Perona and initially Enel were cut, while Monkey D. Garp was demoted to a non-player character, only to return as a DLC character, with Enel also returning as DLC.

* Denotes new characters

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On July 5, 2019, the game was announced at Anime Expo 2019 with a reveal trailer.^[8][9]

On February 11, 2025, in celebration of a successful 4 million sales, ports to the PlayStation 5 and Xbox Series X/S were announced, along with the announcement of additional downloadable content which will be decided by fan votes.^[10] On August 9, it was announced that Enel, a returning character; King, a new character from the Wano Country Arc; and Z from One Piece Film: Z had the most votes and would be added as playable characters in a future update.^[11]

IGN‘s Mitchell Saltzman gave the game a score of 8 out of 10, saying “Pirate Warriors 4 is a great One Piece-flavored spin on the Musou genre with a deep roster and simple but fun combat”.^[16]

The PlayStation 4 version of One Piece: Pirate Warriors 4 was the second best-selling retail game during its first week on sale in Japan, with 75,998 copies being sold. The Switch version was the third bestselling retail game during the same week, selling 61,571 copies.^[20] By December 2020, One Piece: Pirate Warriors 4 had sold over 1 million copies, becoming the fastest entry in the Pirate Warriors series to achieve that milestone.^[21] By August 2022, it had sold over 2 million copies.^[22] By August 2023, it had sold 3 million copies.^[23] By February 2025, it had sold 4 million copies.^[24]