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 LeMU ~Harukanaru Lemuria Tairiku~, opening song of the visual novel Ever17 -the out of infinity-. If you're one of them, feel free to join!

Opening video on YouTube: