The End of the Siren Song

Levi Shio has lived alone for most of her life. After her parents died at the hands of the horrid sirens which they themselves had almost become she made a promise. She vowed on her life to destroy all sirens and save the merpeople from their own corrupted people. To save all of mermanity she has to learn to use legs and try to keep a book and power away from a very angry and ravenous alpha of the sirens. Will she make good on her promise or will she die by the thing she herdelf must destroy?