Loveless is a Japanese manga series written and illustrated by Yun Kōga. It is serialized in the Japanese magazine Monthly Comic Zero Sum by Ichijinsha and collected in thirteen tankōbon as of July 2017. Kōga plans to end the manga at fifteen volumes. The most immediately noticeable aspect of the story is that many characters are kemonomimi—cat-like features (in this case, ears and tails) are universal from birth, so there are as many catboys, including the protagonist, as there are catgirls. People in the Loveless universe lose their animal features when they lose their virginity. Those who no longer have animal features are differentiated by society as “adults”.
In his first day at his new school, a then twelve-year-old Ritsuka Aoyagi meets a mysterious twenty-year-old male named Soubi Agatsuma. Soubi claims to be a good friend of Ritsuka’s brother, Seimei, who was murdered 2 years earlier. Upon the inspection of Seimei’s abandoned computer files, Ritsuka discovers that an organization called ‘Septimal Moon’ was responsible for Seimei’s death.
As Ritsuka quickly discovers, Seimei and Soubi acted as a pair involved in spell battles invoked by carefully selected words. Now Soubi is Ritsuka’s ‘sentouki’, or Fighter Unit, and Ritsuka is his ‘Sacrifice’. Together, they challenge Septimal Moon to find out the truth behind Seimei’s murder and the reason for Ritsuka’s amnesia, and form an intimate bond as they unravel the mystery.
Tokyopop licensed Loveless for an English-language release in North America. The first volume was published on February 7, 2006 and the eighth was released on September 1, 2008; Tokyopop then went out of business. In October 2011, Viz Media announced that they had acquired the license and would continue publishing the series from volume 9. Volume 13 is available for pre-orders online and is set for a June 12, 2018 release. The series is also licensed in Australia and New Zealand by Madman Entertainment, in France by Soleil Manga, in Germany by Egmont Manga & Anime, in Italy by J-POP, in Russia by Comics Factory, and in Brazil by NewPOP.