The Grimoire is an ancient text filled artifact from the world parallel to our own. It holds powerful magic inside of it, yet it cannot be used by the world's inhabitants. The Grimoire itself has a will of its own and thus selects it own master, from our world. However there are rules. The master of the book must be a female of the age to marry in their world, aged eighteen at least. Their social status, race and language do not matter. And they must be pure, no drug use, no alcoholic use and must have never been touched by a man.

Every one hundred in their world, ten years pass in ours. So every ten years, a young woman goes missing, but returns after a time has passed, or not at all. And once the Chosen has been sent to their world, a Protector is waiting, every one hundred years, a man of age is chosen to wait in the Temple of the Grimoire until one is sent there. But something odd has happened in this cycle. The Protector died while waiting, for the Chosen hasn't shown. It has been one hundred and eight years since the last Chosen has shown up.