Let's talk about
Bukatsu no Kouhai ni Semarareteimasu.
You might know this or not, but a lot of professional manga-ka have cut their creative teeth in fandom. CLAMP, of course, is the most common example. They started up making
Captain Tsubasa parody books (of the slash variety, of course), and look where they are now, entertaining millions of fans with their strange, confusing plots and constant ship-teasing. They made it.
Other artists continue making fancomics even after they debut. Murakami Maki, the creator of
Gravitation, for example, has done doujinshi for her own comic. And she isn't the only one.
It's not something you come across back home, is it? You usually don't find a professional using his skills to make fan parodies...
Which brings me to Koshino. She, too, has done (and continues to do) fanbooks, mostly
Fullmetal Alchemist slash. She also has found success with
Bukatsu no Kouhai ni Semarareteimasu (I'm going to start calling it BKS from now on), a comic series that you can find on Libre Mobile's web service. It's done so well that
they've produced an audio version (which is can be bought via Libre Mobile.)
I don't deal with Libre Mobile (and I'm pretty sure you can't either), so when I came across BKS for the first time in Magazine Be-Boy, the May 2011 issue, I thought it was a one-shot. Little did I know...