Hibiki is co-creator of the light novel series Karen Broadcasting Club (カレン坂高校 可憐放送部, Karenzakakōkō Karenhōsōbu, literally "Karen Hill Highschool Cute Broadcasting Club"). The series originated in 2006 as a dōjinshi project by the circle MAGIXX, with related goods sold at that summer's Comic Market. However, by 2007 it had become a commercial publication by Shueisha.
The novels' co-author is Beni Suzumoto (鈴本 紅, Suzumoto Beni) from MAGIXX.As of May 2009, four volumes of the light novel have been published in Japan:Shueisha has also released one drama CD for the series:Bodyguard (ボディガード) light novels by Riuto Takeuchi (たけうち りうと, Takeuchi Riuto)Maria-sama ga Miteru light novels by Oyuki Konno (今野 緒雪, Konno Oyuki), including the Buddha Watches Too spin-offThrone of the Oracle (神語りの玉座, Kamigatari no Gyokuza) light novels by Yuira Nagino (薙野 ゆいら, Nagino Yuira)Calamity Knight: Alternative (カラミティナイト-オルタナティブ-) light novels by Kanata Takase (高瀬 彼方, Takese Kanata)True Fortune (トゥルーフォーチュン) (2008 PlayStation 2 game, character design)Aquarian Age (contributing artist)Comic Yuri Hime (cover art)First Love Sisters (character design)Yuri Shimai (cover art).