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Full Metal Daemon: Muramasa (装甲悪鬼村正, Sōkō Akki Muramasa) is a Japanese visual novel developed and published by Nitroplus for Windows. It was released in Japan on October 30, 2009. An English localisation by JAST USA was released on August 25, 2021. The game is regarded as a masterpiece in the visual novel community. It is also one of JAST USA's most successful releases.