Life changes dramatically for Mars when one fateful Saturday morning, a messenger delivers a book entitled Familiar Magic, a Guide. The book is ancient, and while Mars suspects it’s valuable, he has no idea just how far off the rails things are about to get. You see, ownership of a Familiar’s Guide has marked Mars as magical familiar, and no, it doesn’t turn him into a cat. Much the opposite, it marks him as an extremely rare individual, capable of expanding a witch’s power and training her on the most powerful spells available.