Unbreakable Machine Doll

, 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.

Plot
Early 20th century, mankind was able to establish advanced magic into a system; Machinart. The combination of magic and science which involves running a magic circuit through an automaton and having a puppeteer control it. However, in this era, the technique is being exploited for military use as major world powers are at a frenzied state to outdo each other. As a World War looms, Raishin Akabane, a puppeteer from Japan, together with Yaya, his automaton, arrived in Machine City Liverpool in United Kingdom and entered the Walpurgis Royal Academy of Machinart to join the Night Party, a series of battles wherein Machinart clash until there is only one left standing and become the Wiseman, mainly, to spy on the latest Machinart developed by major world powers for the Japanese Army, though in actuality, to exact revenge on his brother Tenzen Akabane whom he assumes of having killed their clan and he assumes of being Magnus.