Ichiban Ushiro no Dai Maō (いちばんうしろの大魔王?), or Demon King Daimao, is a Japanese light novel series by Shōtarō Mizuki, with illustrations by Souichi Itō. As of December 1, 2009, eight volumes have been published by Hobby Japan under their HJ Bunko imprint. A manga adaptation by Souichi Itō started serialization in the shōnen magazine Champion Red on September 19, 2008.
The story of "love, magic, and battles" revolves around Akuto Sai, a boy who aims to become part of his country's highest order of magicians and contribute to society. His dream is to one day become a "high priest", an exemplar and champion of good. On the day he is admitted into the Constant Magick Academy, his aptitude test predicts the following: "Future Occupation … Demon Lord ." Thus begins his difficult school life in which he is resented by his studious female class head, desired by a girl with mysterious powers, and guarded by a beautiful female android.
Voiced by: Takashi Kondo, Kaori Akashi (child)
Akuto Sai was left on the doorsteps of a church by an unknown woman. He grows up and transfers into the Costant Academy for Magick Arts, hoping to someday become a high priest. He meets Junko Hattori on the train to the school and forms a pact with her to make the world a better place. However, upon arriving, Yata Garasu, the school's oracular spirit, predicts that he will become a Demon King in the future. These predictions have never been wrong before, and the student body becomes terrified and paranoid of him as a result. Even so, he still tries to do the right thing when the situation arises and he is shown to have an incredible amount of power within him. He can control ¨mana¨ For example, he is able to absorb the mana of a demon dog thus transforming it back into a puppy, a feat that has never been performed before. However, his immense power is also highly volatile and most of his attempts at creating magical projectiles, no matter how benign they are supposed to be, usually result in catastrophic explosions. Over the course of the series, Akuto is able to persuade more students to trust him, or at the very least not to assassinate him. He later acquires a powerful "artifact" that belonged to the previous Demon King, a massive dragon named Peterhausen (ピーターハウゼン, Pītāhausen?).