Brian loved books. So much so that he would go into any bookstore he could find. He wasn't looking for anything specific. Brian just loved the smell of old bookstores, which was peculiar since he rarely read those old books. He tended to read contemporary genres. However, one day, he walked into a bookstore, and somehow there was a book there that fell on his head and got slightly damaged.

The owner made him buy it, and a cost that left him speechless.

However, little did he know that his book was a Grimior. A lost one for calling up Demons. While Brian was reading it one night, he suddenly ended up calling an Imp. Quite accidentally, as he didn't mean to, since he had no clue what the damn book was talking about.

An Imp with an attitude. The Imp thought himself of a higher station than Brian, since before, he used to be the assistant of a Demon Lord, and quite a powerful one, from over 5,000 years ago. With the Imp's help, which felt like pulling teeth, he was able to call up his first Succubis, and that's when things got really interesting for Brian. His life was about to change drastically. For good or bad? Even he's not sure, as suddenly there are more Demon Mages out there who want his book for the power it contains.