Kämpfer is a Japanese light novel series by Toshihiko Tsukiji, with illustrations by Senmu. The series contains 15 volumes, published by Media Factory under their MF Bunko J imprint between November 2006 and March 2010. The main series covers 12 volumes, while the remaining three are short story collections. A manga adaptation by Yu Tachibana started serialization in the April 2008 issue of Monthly Comic Alive. A 12-episode anime adaptation aired in Japan between October and December 2009 on TBS, and concluded in 2011 with Kämpfer für die Liebe.

Megumi Nakajima is a Japanese voice actress and singer, who is affiliated with Stay Luck. In 2003, she joined the talent agency Stardust Promotion after passing their audition. Later, in 2007, she debuted as a voice actress and singer after passing an audition held by the music company Victor Entertainment; she was then cast as the character Ranka Lee in the 2008 anime series Macross Frontier. Her first solo single "Tenshi ni Naritai" was released in 2009, which was followed by her first solo album I Love You in 2010.