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 the relationship between the characters Michael Lee and Robin Sena from the anime series Witch Hunter Robin. If you're one of them, feel free to join!