Hundreds of years ago fairytale creatures lived among humans. But then humans became more and more powerful and the mythical beings were no longer needed so they vanished. But this story isn't about the past. It's about a Siren (a more evolved version that lives on land and can control a person with a single command) girl named Avalon who's mother is dying. Avalon is determined to save her but it means that she has to venture to a forbidden place; the human world.