Unbreakable Machine Doll (機巧少女は傷つかない, Mashin-Dōru wa Kizutsukanai; also known as Kikou Shojo wa Kizutsukanai), is a Japanese light novel series written by Reiji Kaitō and illustrated by Ruroo. Media Factory has published 12 volumes under their MF Bunko J imprint since November 2009. A manga adaptation by Hakaru Takagi began serialization in Media Factory's Monthly Comic Alive magazine in 2010. A 12-episode anime adaptation began airing in Japan in October 2013, and all 12 have now aired .