What is a fanlisting? Here's a brief explanation.

A fanlisting is simply an online list of fans of a subject, such as a TV show, actor, or musician, that is created by an individual and open for fans from around the world to join. There are no costs, and the only requirements to join a fanlisting are your name and country.
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s quoted from The Fanlistings. This particular fanlisting is dedicated to uniting fans of the character Naoto Fuyumine from the manga and OVA Dogs/Dogs: Bullets & Carnage. It is listed at Anime Fanlistings.