Novel
A set of six novels published under the title "Kamen Rider Hibiki: Compass to Tomorrow" (仮面ライダー響鬼 明日への指針（コンパス）, Kamen Raidā Hibiki Asu e no Konpasu?) was released shortly after the end of the series. The novels followed relatively the same plot as the TV series but added new characters and enemies towards the end of its run.
Read more about this topic: Kamen Rider Hibiki