Kujibiki Unbalance is a three-episode original video animation spin-off of Genshiken series, as well as a series of three light novels by Genshiken anime collaborator Michiko Yokote. Within the world of Genshiken, however, Kujibiki Unbalance is a popular manga and 26-episode anime adaptation, which is eagerly watched and discussed by the main characters. These same characters also purchase associated products and adult-oriented dojinshi based on the series, which constitute the motivation for some of the "club activities" held by the Genshiken. Genshiken characters who are fans of Kujibiki Unbalance tend to refer to it by the shorthand name of Kuji-Un .

Genshiken (げんしけん) is a Japanese manga series by Shimoku Kio about a college club for otaku and their lifestyle. The title is a shortening of the club's official name, Gendai Shikaku Bunka Kenkyūkai (現代視覚文化研究会), or "The Society for the Study of Modern Visual Culture". The series has also been adapted into an anime directed by Tsutomu Mizushima. The manga originally ran in Kodansha's magazine Monthly Afternoon from April 2002 to May 2006, and has been reprinted in nine bound volumes.