Leo Black was originally a boy from a small fishing village. When his family was robbed by pirates when he was a child, he vowed to make his name known in the Seven Seas. He gathered a group of like-minded partners and set foot on the ocean in the dilapidated "Liberty". An encounter with a mysterious treasure map triggered a battle of wits and courage with the powerful Red Mane Pirates. In the process of exploring the major islands, the companions constantly encounter jokes and crises, and the friendship becomes closer through experience. Leo gradually matures at the critical moment of life and death, and finally reveals the shocking secret behind the treasure map. After stopping Vito's evil plan to disrupt the order of the Seven Seas, Leo and his companions chose to still wander the ocean, and the legend spread. The whole story has ups and downs, is humorous and compact, and is full of strong interest in pirate adventure.