MF Bunko J
"Unbreakable Machine-Doll" began as a light novel series, written by Reiji Kaitō and illustrated by Ruroo. The first volume was published by Media Factory under their MF Bunko J imprint on November 21, 2009. The last, seventeenth volume was published on July 25, 2017. A drama CD was released with a special edition of the fourth volume. In June 2017 Kadokawa released a commercial promoting the end of the series.