Anyone can request anything, however, the following guidelines do increase the likelihood of your favorite anime/drama/song/documentary et al. being added to the terakoya.
Request something that exists. No seriously.
Request something popular with a large and active fan base.
Request something less popular but with an established and active fanbase.
Request something that isn’t popular, but despite this oversight from the cold, cruel world, you and you alone are prepared to dedicate a chunk of your life to its study. Gulp. Are you sure about this one?
Request something in a genre/sub-genre that we currently do not offer. Chances are good you’re not the only one looking for it.
With that said, the above are only guidelines, so fire away in the comments below!