The Revealed Secret, The Truth about the Ancient Weapon.
The island celebrates the defeat and capture of Hordy Jones, and the Straw Hat Pirates fly away unnoticed. Jimbei tells Luffy that he cannot join his crew now but will come see them again.
The island celebrates the defeat and capture of Hordy Jones, and the Straw Hat Pirates fly away unnoticed. Jimbei tells Luffy that he cannot join his crew now but will come see them again when he fulfills his current obligations. A soldier from Ryugu Palace catches up to them and invites them to the party that was originally planned. During the festivities, Robin asks Neptune to meet with her alone. She asks him about Joy Boy, and Neptune tells her what he knows. Joy Boy is a man from the surface who lived in the Void Century, who, on the Poneglyph in the Sea Forest is apologizing to the Mermaid Princess of that time. He broke his promise to her, but one day, someone is supposed to appear and carry out the promise on his behalf. The royal family of Fish-Man Island continues to keep their end of the promise of looking after the Noah, whose purpose will be revealed only when the promised day comes. Neptune also tells Robin that it is the Mermaid Princess and not Joy Boy who has power over Sea Kings. She then reveals that the Poneglyph on Skypiea said that an ancient weapon is located on Fish-Man Island and deduces that the weapon is the Mermaid Princess, also known as Poseidon.
