Demon King Daimao

Ichiban Ushiro no Dai Maō (いちばんうしろの大魔王? /"The Great Demon King in the Back Row"), also known as Demon King Daimao (english dub title), is a Japanese light novel series written by Shotaro Mizuki and illustrated by Souichi Itō, published by Hobby Japan under their HJ Bunko imprint. The first volume was published on February 1, 2008, with a total of 11 volumes available as of December 2010. A manga adaptation began monthly serialization in the September 2008 issue of Akita Shoten's magazine Champion Red, and a 12-episode anime adaptation by Artland aired between April and June 2010 on Tokyo MX and other channels.

Akuto Sai (紗伊 阿九斗/Sai Akuto? )
The protagonist of the series, Akuto Sai is an orphan who transfers into Constant Magick Academy, hoping to someday become a high priest for the benefit of society. However, upon arriving, Yatagarasu, the school's oracular spirit, predicts that he will become a Demon King in the future. As a result, the entire student body becomes terrified and paranoid of him. Even so, he still does good deeds and tries to do the right thing when the situation arises, and he is shown to have an incredible amount of power within him. Akuto is capable of controlling and manipulating "mana", a magical energy that resides in the bodies of living things and in surroundings. For example, he is able to absorb the mana of a demon dog thus transforming it back into a normal puppy, a feat that has never been performed before. However, his immense power is also highly volatile and most of his early attempts at controlling mana and 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 to try not to assassinate him. He soon realizes he is in love with Kena; he also has flashback of him and her as orphans and he was the one who gave the hairpin to her before he left. His name is phonetically very similar to a Japanese phrase meaning "Great/Ultimate villain"

He is voiced by: Daisuke Ono (Drama CD), Takashi Kondo (Japanese), and Chris Patton (English).