Loveless is a fantasy manga by Yun Kouga. It is currently serialized in the monthly magazine Monthly Comic Zero Sum published by Ichijinsha. Eight compilation volumes have been released. The manga is licensed for US release by Tokyopop, with eight volumes released as of September 2008. A 12 episode anime television series adaptation was made by J.C.Staff, broadcast in a post-midnight slot on TV Asahi and ABC from April 2005 to June 2005. The anime series was licensed and released in the US by Media Blasters in a set of 3 DVDs in early 2006.
The most immediately striking aspect of the story is that many characters are kemonomimi, and not only the conventional catgirls — cat features (ears and tails) are universal from birth, so there are as many catboys, including the protagonist. Those who no longer have the animal features are differentiated by society as "adults" who've lost their virginity, illustrating an underlying theme about sexuality in society.