Ruby Gillman wants to be an ordinary teenager at Oceanside High. But when she learns that she descends from a line of powerful royal krakens, it becomes clear that she is anything but normal. Ruby will one day become the Warrior Queen of the Seven Seas, protecting the oceans from the vanity of her sworn adversaries, the mermaids. But before she can do that, she needs to face the newest, most popular girl at school, Chelsea who also just happens to be a mermaid.