Fullmetal Daemon Muramasa is a visual novel developed by Nitroplus. Set in an alternate history where Japan is ruled by powerful warlords wielding mystical armors called 'Tsukimoridai,' the story follows protagonist Kageaki Minato as he seeks revenge against the demonically possessed armor, Muramasa. The game explores themes of morality, consequence, and the cost of vengeance, making it a complex narrative experience. It is renowned for its deep story, intricate character development, and stunning visuals.