Nobita Nobi and his friends are discussing school project themed around seas and oceans. Interested in pirate life and treasury, Nobita asks Doraemon (Character) to help him find secret treasures. Doraemon at first denies the pirates roaming in the present day as well as the existence of secret treasures, but after learning news about recently discovered treasury, he helps Nobita in his sea voyage in search for the secret treasure. Bringing along Shizuka Minamoto, Takeshi Goda, and Suneo Honekawa, they roam the Pacific Ocean while playing ship and sea danger simulators with Doraemon's gadgets.