The story follows 14-year-old Nanami, her lifelong orca companion, Tico, and her traveling partner, 17-year-old Seira, as they travel the ocean in search of a hidden treasure and discover what is truly important to humankind. During their adventure they will come to understand the answer to the question Nanamiās father, Professor Scott, posed before they left home, āWhat is more important than material fortune?ā