One Piece: Unlimited Cruise 1: The Treasure Beneath the Waves (One Piece Unlimited Cruise: Episode 1 - Nami ni Yureru Hihou)

Venture into the expanse of the open sea and navigate your way across various
islands with the Thousand Sunny as a base. Introducing the ultimate One Piece game filled with adventure, battles, and a touching storyline! While at sea, the Straw Hat Pirates encounter waters that are guarded by a mysterious ancient civilization. Thus begins a grand voyage across the many islands that are centered around a large mystic tree, with a storyline that spreads over two games!