A fanlisting is a place for all fans of a particular show, movie, actor/actress, singer, etc. to come together and build the biggest listing of people from all around the world who are fans of that subject.
(from TheFanlistings.org)

This particular fanlisting is for fans of Honoka from the anime series The Third ~Aoi Hitomi no Shoujo~. If you're one of them, feel free to join!