Full Metal Daemon: Muramasa

Also known as:  FullMetalDaemon Muramasa, FMD Muramasa, Soukou Akki Muramasa

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.

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Producers, official website and other details: VNDB, Wiki