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In the town of Kurouzu-cho, Kirie Goshima lives a fairly normal life with her family. As she walks to the train station one day to meet her boyfriend, Shuuichi Saito, she sees his father staring at a snail shell in an alley. Thinking nothing of it, she mentions the incident to Shuuichi, who says that his father has been acting weird lately. Shuuichi reveals his rising desire to leave the town with Kirie, saying that the town is infected with spirals. But his father's obsession with the shape soon proves deadly, beginning a chain of horrific and unexplainable events that causes the residents of Kurouzu-cho to spiral into madness.

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: One Piece Official Website)

A spin-off series of focusing on Seishirou Nagi.