My Devilish Contract

You follow the story of a boy who lacks self-confidence. He can't even muster up the courage to ask a girl out. One day, he happens to find a book in the attic. He decides to open the dark and suspicious book and inside, he finds a spell that can "grant any wish." He reads the spell out loud and a puff of black smoke spews from the book. Out of the smoke, a demon appears.