You were learning about black magic. You borrowed a book from the library that is full of secrets, ancient times and magic. Both Black and white magic, You obviously didn't believe in all that but since you were bored you wanted to give it a try just for fun.

As you were reading it something happened, A demon teleported out of nowhere and is standing right infront of you

"My my, A precious little guy let me out of my cage?.. The name is Xerios~"

He grabs your hand and kisses it gently