introduction
So what is this fanlisting thing you're talking about?
Simple: A list of fans. There's no obligation, requirements or costs to join, other than you having to like the subject the fanlisting is for, which in this case, is the anime and manga series Mushishi by Urushibara Yuki. :)
You can find out more about fanlistings at either TAFL or TFL, the 2 main networks for fanlistings.