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 begins2004年夏发卖的荒唐无稽超级机器人ADV游戏《机神咆吼Demombane》的TV动画化，现在锐意制作中。动画制作与游戏软件同捆的OVA制作的数字动画是北之雄“ヴューワークス”，监督是以机械监制和机械演出而出名的“増尾昭一”，剧本构成决定由参与了天地无用的剧本构成的“黑田洋介”，制作班底强大，因此请好好地在电视机前享受Demombane带来的乐趣吧。另外,在书店好评发卖中的《コンプティーク》誌和《NEWTYPE》志的11月号中也刊载了《机神咆吼Demomban》的动画化消息，特别在《コンプティーク》誌中，更有担当原画的Niθ的所描绘的插图，以及剧本构成的黑田洋介的独家采访。
