Kallistos is a fanlisting and small fansite dedicated to Atobe Keigo, the real prince of Tennis no Oujisama (Prince of Tennis in English). It has been listed by AnimeFanlistings.org since October 2003, where it covers Atobe in the original manga and anime series. Since January 2006, it is also listed at TheFanlistings.org, to cover Atobe's theatrical/musical version. Please consider joinining if you're a fan of him! ^^
Atobe Keigo is the captain of Hyoutei Gakuen's tennis club (in addition to also being student body president); but so much more than that too. He's their inspiration, and Hyoutei adores him in a way that no other school in Prince of Tennis adores its captain.