Board Thread:General Discussion/@comment-6025653-20150222154650/@comment-32856285-20150223073740

There's no reference there, because Harry Potter isn't the only story about a "kid going to a special school". It is, in fact, a theme used by many anime/manga. Many have even used alternatives like Clubs, Guilds, Organizations, with almost the exact same set up. Some even used alternate takes on it, like Rosario+Vampire.