A Tail In The Water

Ariel is a young girl who thinks she goes to a normal high school, has normal parents, and a perfectly normal life.
Well she's wrong.
What she doesn't know is that her parent's found her by the shore of the ocean and have been lying to her, by telling her that she's their real daughter.
What she doesn't know is that her real mom and dad were mermaids who might be dead.
What she doesn't know is that she herself is a mermaid, who's tail is formed when she feels strong emotions.
And what she doesn't know is that a group of evil, and deadly mermaids called Blood Tails who's own tails are hideous and nauseating and that they kill other mermaids so they can use their tails to cover their own.
Ariel is clueless and oblivious to her true identity.
But not for long.....