Full Metal Daemon: Muramasa (Soukou Akki Muramasa) is a PC eroge created by the veteran studio Nitroplus known for such titles as Saya no Uta, or Chaos;Head, among others. The story takes place in an alternate-history during the first half of the 20th century, when Japan is ruled with an iron fist of robotic suits of armor called Tsurugi. FMD Muramasa was released on October 30, 2009.