Kuro Daijuuji is a poor detective living in Arkham City. One day, he was requested by Ruri Hado of Hado Financial Group, to search for a magic book. While he initially refused, Ruri offered him a large sum of money upon pletion of her request, in which bribed Kuro to accept. As Kuro searches for the book, he unexpectedly runs into Al, a pretty girl that is actually a powerful grimoire. They forge a contract with each other, bestowing Kuro with powerful magic. Soon afterwards, Al also activates Demonbane, a deus machina owned by the Hado Financial Group, to bat the mechanical menace from the Black Lodge. With this, the war between the Hado Financial Group and the Black Lodge begins
2004年夏發賣的荒唐無稽超級機器人ADV遊戲《機神咆吼Demombane》的TV動畫化，現在銳意製作中。動畫製作與遊戲軟件同捆的OVA製作的數字動畫是北之雄“ヴューワークス”，監督是以機械監製和機械演出而出名的“増尾昭一”，劇本構成決定由參與了天地無用的劇本構成的“黑田洋介”，製作班底強大，因此請好好地在電視機前享受Demombane帶來的樂趣吧。另外,在書店好評發賣中的《コンプティーク》誌和《NEWTYPE》志的11月號中也刊載了《機神咆吼Demomban》的動畫化消息，特別在《コンプティーク》誌中，更有擔當原畫的Niθ的所描繪的插圖，以及劇本構成的黑田洋介的獨家採訪。
