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Identity: It's a fanmade MSA anime and manhwa.
Background: In Japan, during World War II, in 1945, a 42-year-old young woman who became immortal at 20 In the Taisho era, in 1913 named Kirika was being hailed as the new Hua Mulan from the Ballad of Mulan because their story was similar. Her father was ill so, she took his place. When she was asked who she was, she revealed her true identity. What happens next?