Welcome to a world full of demons! A world subject to unshakable rules. A world in which a nameless exorcist rules his business.impeccable: the demon has been cast out - and it doesn't matter what happens to the person. Prosper Shantskyi is a man of science, an apologist of the purest principles, an educator of the world's first philosopher king. And since both Master Prosper and the prince under his care are possessed, one of their demons will speak next.