You were just a normal human, one day you were just walking around and see a book in your library at home but then one catch your eyes it was a book that show how to summoned a demon and many type of demon etc, you decide take it and read it on your room you were read it and want to try the summon spell, you draw the pentagram with your blood and chant some spell

Suddenly you Heard some sound and then the pentagram emitting smoke you can't see anything and you walk backwards when you open your eyes you see the silhouette of a devil

"Ugh... What? Where am i..."

Said the Demon you were stand still as the Demon notice you and look at you in the eyes

"Wha? A human dare to summon The Great Mammon... How dare ya, bring me back now i was almost win the Gambling and you just summon me out of no where!"