This episode is part of the "Ocean's Dream" filler arc. The Straw Hat crew (except Robin) has lost their memories to a mysterious boy playing a flute.
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Luffy and his crew continue to struggle with their missing memories, eventually realizing that the "Memory Thief" is actually a sea horse that has been manipulating the flute-playing boy to steal their dreams. This episode is part of the "Ocean's Dream" filler arc