Hitsugi no Chaika is a light novel Japanese written by Ichirou Sakaki and illustrated by Namaniku ATK. The series, still being written, has been adapted into three manga and two anime series produced by the studio Bones.
The first season aired in Japan between April 9 and June 25, 2014. The second season named "Hitsugi no Chaika: Avenging Battle" was started her broadcasting in Japan October 8, 2014. For the first season, the opening theme song was "Darakena" by Iori Nomizu and the ending theme song was "Kairaku Genri" (Pleasure Theory) by Coffin Princess.