Prequel to One Piece Film: Gold. The Straw Hat Pirates meet Olga, a young lady who has gotten away from the island Alchemi. Alchemi was known for its metal generation, and for the formation of the amazingly important Pure Gold, however the island vanished two hundred years back. Olga is presently being sought after by Marines, inspired by Pure Gold. Gildo Tesoro, who controls the underground market, knows about Olga and contracts treasure seeker Mad Treasure to track her down. The Straw Hats unite with Olga looking for the Pure Gold, while she plots to exploit them and utilize the fortune to wind up rich herself.