A Dark Rabbit Has Seven Lives (いつか天魔の黒ウサギ, Itsuka Tenma no Kuro Usagi, lit. The Devil's Black Rabbit of an Unknown Time) is a Japanese light novel series by Takaya Kagami, with illustrations by Brazilian illustrator Yū Kamiya. The series includes 13 novels published by Fujimi Shobo between November 2008 and December 2013. The series also has a spin-off series, Kurenai Gekkō no Seitokaishitsu (紅月光の生徒会室, Gekkō Kurenai's Student Council Room), which has five volumes since February 2010.