Deus Machina Demonbane

Genre: Mecha, Action, Romance

Zanma Taisei Demonbane (斬魔大聖デモンベイン, Zanma Taisei Demonbein)

Also known as Deus Machina Demonbane. The first of the series published on April 25, 2003, the title loosely translates to "Demon-Slaying Grand Saint Demonbane".

Type	Game
Title	Deus Machina Demonbane
Developer	Nitroplus
Publisher	Nitroplus (PC, PS2) Kadokawa Shoten (PS2)
Genre	Eroge, Visual novel
Rating	18+ (PC) CERO: 15+ (PS2 re-release)
Platform	Windows, PlayStation 2
Released	Windows JP April 25, 2003 NA May 13, 2011 PlayStation 2 JP July 1, 2004

http://en.wikipedia.org/wiki/Demonbane

Demonbane (デモンベイン)

Genre: Mecha, Action, Romance

Demonbane (デモンベイン, Demonbein) is a series by Nitroplus with mecha and Cthulhu Mythos elements. Beginning as an eroge for the PC, it was ported into a PlayStation 2 non-eroge remake, a sequel visual novel, a prequel novel, a television anime adaptation and a conversion to manga. An English version of the original Demonbane PC game has been released by JAST USA.