Sistine is happy with her life the way it is, especially her academic life. She is studying magic and has a good tutor. That is, until he retires and a substitute teacher takes over his classes. Sistine soon has to realize that her new teacher is a lazy bastard and doesn't plan on teaching them anything, which stands in the way of her life-goal to find the sky castle. And how did that strange teacher end up getting the job anyway, since her past teacher would never have picked him as his substitute if he new he was that incompetent.