Unbreakable Machine-Doll (機巧少女は傷つかない, Mashin-Dōru wa Kizutsukanai, also known as Kikō Shōjo wa Kizutsukanai), is a Japanese light novel series written by Reiji Kaitō and illustrated by Ruroo. Media Factory has published 14 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 television series adaptation aired in Japan between October and December 2013.