The Straw Hats chased the mysterious big bird to the Reckoning Island, but unexpectedly fell into the iron rule of "equivalent exchange" - taking people's property will drain away their physical strength, telling lies will cause black spots, accepting help will cause memory loss, and debts owed will eventually be repaid with interest. The entire island is like a huge contract prison, and even ships cannot sail out of this sea area.
In order to solve the deadlock, everyone followed the clues and rushed to the ancient ruins deep in the island. They broke through the three tests of objects, love and dreams, and faced the liquidators who maintained the rules. When the shackles of absolute fairness trapped everyone, Luffy used a sharing without asking for anything in return to break the contractual dilemma that had lasted for hundreds of years.
