Overview:
Two years after the Summit War in which Straw Hat pirate Luffy lost his brother Ace, the story takes place on the Sabaody Archipelago. The protagonist, a young girl who has a strong admiration for Nami, sets off on a small adventure. This is an ensemble drama that focuses on people who do not "pursue" ONE PIECE, depicting the reunion of the Straw Hat Pirates from their perspective.
(Source: Official site, translated)