Dakelh, the people of the sea, were made to protect the oceans treasures and keep all safe. Mermaids are peaceful creatures, and all the other species live together in what seems to be perfect harmony.
Sereia, Isla, and Naia enjoyed their ordinary life in Australia. But when they get stranded on an island and stumble upon a sea cave, everything changes. Land or sea, they grapple with their newfound abilities while helping out friends and defeating foes.
(also posted on AO3)