A story about Monkey D. Luffy, who wants to become a real pirate. In a world of mystical, those who eat mystical fruit will gain its true power but also has its greatest weakness. For example, Luffy ate Gum-Gum Fruit which gave him a strange power but he can NEVER swim. His dream of becoming a pirate to find the ultimate treasure. His greatest fear is the big ocean. Nevertheless, he journeys by himself to find more people to go with him on his journey. Along his ways, with luck and determination, he finds himself many members who are devoted but to different causes. Together, they sail the Seven Seas of adventure in search of the elusive treasure "One Piece."