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.

Plot
During the early 20th century, along with technological advancements, scientists were able to develop sophisticated magic. The combination of science and sorcery was the Magic Circuits (Machinart) made from spells that were put into objects to bring them to life and even gain a personality by using an Eve's Heart. It was developed as a military weapon and has now spread throughout the world. Akabane Raishin is now attending the Royal Academy to become the best in the world. Accompanied by the lovely teenage girl Yaya, who is actually Raishin’s puppet weapon, he plans on rocketing to the top of the class. However, his academic test scores are second to last although his combat skills and determination are second to none. Raishin has to compete with the most deadliest of classmates and atomatons, if he wants to come out in the Wiseman's Chair and must defeat the 99 class men ceded above in Walpurgris-Night event.