Something that’s hard to do, no matter who you are, is change your way of thinking. It sounds simple enough, though, especially given the context. If you were raised to learn that one plus one equals three, it’s mathematically possible to prove you incorrectly and move your thinking from wrong to right. But what if it was something more esoteric? Perhaps you’ve always known that after dinner you should have three cookies, but somebody comes along and says no; that you should have four, not three, to whet your appetite. Are you right, or is the other person? But even more important, is there a different way to think? While Junketsu no Maria doesn’t deal with numbers or desserts, it’s this idea of changing one’s beliefs that makes it quite the interesting anime to see.