Inspired by the legendary tale of Treasure Island, Nobita envisions embarking on a quest to uncover his very own hidden treasure trove, despite the world being thoroughly mapped. With the aid of Doraemon, he is bestowed a mysterious map revealing the whereabouts of a treasure island. Meanwhile, news breaks about the unearthing of a previously uncharted island, fueling Nobita's belief that it is the fabled treasure island. Rallying Doraemon and Shizuka for the expedition, Gian and Suneo join the adventurous crew. Yet, their journey takes a perilous turn as they approach the island, encountering a menacing band of pirates.