Harry Potter?
Ever realize how similar the premise of Harry Potter is to this? There' s another society that manages to keep itself hidden from humans. The main characters (3 in both) go to a school. There's 2 guys and a girl. The girl is super smart but still hangs out with 2 average students who always pull her into their mischief. And both have characters nammed Krum(m.) Hmm.
What is the use of wizardry if it cannot save a unicorn?