Volume 56 is titled "Thank You".
The outside colored cover is magenta, and the title logo is maroon, light red fading from white, and gray. The author's name is written in light red.
In the center is Emporio Ivankov standing with his arms sticking out. Standing in front of him, from right to left, are Jinbe, Luffy, and Crocodile. In a background panel by Ivankov's head are Inazuma on his left and Daz Bonez on his right.
- 542. Another Incident to Be Told (やがて語られるもう一つの事件 Yagate katarareru mou hitotsu no jiken?): Ace is led to his execution as Luffy's group continues spreading chaos. Meanwhile, the Blackbeard Pirates arrive at Impel Down, and Shiliew is set free to stop them.
- 543. Straw Hat and Blackbeard (麦わらと黒ひげ Mugiwara to Kurohige?): Blackbeard confronts Shiliew as Luffy battles Hannyabal. However, Blackbeard arrives, takes out Hannyabal, and confronts Luffy, where Luffy learns Blackbeard is the mysterious man he met previously in Mock Town.
- 544. Even the Lid of Hell's Cauldron Will Open (地獄の釜の蓋もあく Jigoku no kama no futa mo aku?): Luffy becomes angry as Blackbeard is responsible for Ace's capture and upcoming execution and fights him, but is no match for him before Jinbe breaks them up reminding Luffy that saving Ace is more important as Magellan arrives and defeats the Blackbeard Pirates.
- 545. To the Sunshine in Outside World (陽のあたるシャバへ Hi no ataru shaba e?): Ivankov and Inazuma confront Magellan, but are defeated. The two groups of escapees then meet up as Luffy fights Magellan with Mr. 3's help.
- 546. Fish-Man Pirate Captain Jinbe, Warlord of the Sea (魚人海賊団船長“七武海”ジンベエ Gyojin kaizoku dan senchō "Shichibukai" Jinbē?): Luffy and Mr. 3 fight Magellan as Jinbe helps a group of escapees board a Marine battleship so they could capture it.
- 547. Escaping the Island (島破り Shimayaburi?): After unveiling his strongest poison, Magellan forces Luffy and his allies to retreat as they escape into the open. With Jinbe's help, they safely make it unto the battleship.
- 548. Thank You (ありがとう Arigatō?): Mr. 2 stays behind and faces Magellan's wrath in order to help Luffy and the prisoners escape by opening the Gates of Justice for them to go through.
- 549. Ship Sailing Forth (出撃の艦 Shutsugeki no fune?): After he cured the Blackbeard Pirates of Magellan's poison, Blackbeard and Shiliew form an alliance, Jinbe reveals himself to be a Warlord of the Sea, and Buggy is revealed to have sailed with Gol D. Roger.
- 550. Marine Headquarters (海軍本部 Kaigun honbu?): People all over the world talk about the coming war as Ace is led to the gallows. Sengoku then reveals Ace to be the son of Gol. D. Roger, confirming that he and Luffy are actually foster brothers.
- 551. Whitebeard of the Four Emperors (四皇"白ひげ" Yonkō "Shirohige"?): As the world reacts to Ace's lineage, Whitebeard and his crew arrives at Marineford.
- Death Wink is explained.
- Oda says he does not want ideas for Devil Fruits but does want ideas for chapter covers.
- Oda draws the Straw Hats genderswapped, beginning a series of drawing genderswapped characters.
- The countries the Straw Hats would come from if they lived in the real world are shown.
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