Nanami Simpson lives on a boat with her marine biologist father. Together with their adopted Orca whale Tico they travel the Australian coast exploring the marine wildlife. One day life turns upside down when Cheryl Melville, a wealthy girl from England, decides that she’s bored with her lifestyle and wants to adventure with them on the boat! All too soon, Nanami, Tico, and the rest of the gang find themselves embroiled in all sorts of trouble in which they battle bad guys and protect the animals of the sea. One thing is for sure – life with Tico never gets boring!