Post-War Arc

The Post-War arc is the twenty-third story arc in the series, and the sixth in the Whitebeard War Saga of the One Piece series, continuing on from Marineford arc. The world reels from the death of Whitebeard, causing chaos to ripple all across the Grand Line. Luffy's mind and body are in critical condition, having not only endured breaking into and escaping from Impel Down and battling through the Marines at Marineford, but having all of his work come to naught due to Ace's death. Boa Hancock leads Luffy's allies to take him to Amazon Lily where he may recover from his drastic injuries. As the Marines cool down from their great battle, Sengoku learns that the World Government is taking strange courses of action...

An Era Ends, An Era Begins: Whitebeard's Protection Is Gone
All across the world, civilians rejoice that the Marines emerged victorious in the Battle of Marineford. The Eleven Supernovas, having all assimilated at Marineford to take part in the battle (viewing it from a safe distance), realize that Whitebeard has been killed, and all take their own separate actions. Eustass Kid claims that due to Whitebeard's death, the Yonkou's loss (consisting now of only Shanks, Kaidou, and Big Mom) has caused the balance of the Three Great Powers to crumble, and the world is about to enter an age like nothing ever seen before.

The world reacts in different manners to Whitebeard's death. Pirates celebrate that Whitebeard claimed that One Piece definitely exists. Civilians and Marines cheer that Whitebeard is dead. A band of ferocious pirates, under the helm of the self-proclaimed "Brownbeard", attacks the town of Foodvalten, which was formerly protected by Whitebeard. Even though the Marines were victorious, their victory has inevitably brought nothing but chaos.

Hancock, having traced Law's submarine through Salome, turns the Marines on her ship to stone and inquires on Luffy's condition. Law informs Hancock that Luffy's life is preserved for the moment, but that he is in critical condition. At that moment, the Impel Down prisoners, led by Ivankov, arrive in a stolen Marine ship. The Newkama Land citizens cheer that they will finally be able to head forth to the Kamabakka Kingdom now that the war is over and they are finally free. Ivankov informs Hancock on the trials he had to endure in escaping Impel Down, and how the death of Ace would crush anyone's mind. This prompts Hancock musing to herself, wishing that she could have instead been in Luffy's place, making at least two members of Law's crew note to themselves how nice it must be to have the Pirate Empress herself looking out for the Straw Hat's well-being. When Ivankov asks Law why he saved Luffy, he claims that he had no obligation, and Ivankov understands that he had done it without thinking.

Jinbei emerges from the sub, thanking Law for saving his life. Although Ivankov tells him to rest, he says that he can not, for his heart is in too much turmoil. He worries more for not Luffy's current condition, but rather what will happen when he awakens. Hancock demands that Bepo give her a Den Den Mushi; she claims that she can call the Kuja Pirates to carry them across the Calm Belt to Amazon Lily, where Luffy should be able to recover without possible discovery by the Marines.

At the destroyed Marineford, Sengoku is by Brandnew informed that Magellan had been beaten to an inch of his life. Upon reaching Level 6, Blackbeard had instructed the prisoners in each cage to engage in a battle for life and death, and the winners would be set free. Although Blackbeard only took four prisoners with him, there were many Level 6 prisoners that were missing, having escaped during the chaos. Although Sengoku demands that wanted posters of the escaped criminals be sent throughout the world, Brandnew claims that the World Government has chosen to hide the information of the Level 6 prisoners escaping, lest the world lose trust in the World Government, a decision which enrages Sengoku.

Elsewhere on Marineford, Donquixote Doflamingo and the Pacifista are beating Gecko Moria within an inch of his life. Doflamingo claims that the government has decided that he is too weak to remain in the Shichibukai, and that it would be better if he was thought to be "killed in the war" rather than eliminated by the government. Moria asks if Sengoku is behind the decision, but Doflamingo claims that the decision was made by powers even higher than he.