A few days before Fox officially inherits his family's treasured heirloom—a mysterious map—the Tufugu Pirates burst into his home and abduct him, seizing the strange map in the process. Buta, a formidable mercenary, is employed by dubious figures to assist in the hunt for the treasure. Through a stroke of immense luck, Buta and Fox cross paths in the depths of a pirate vessel. Will Fox manage to persuade Buta to rescue him, or will the legendary treasure end up in the clutches of criminals?