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Munakata Tadakusu, a folklorist and professor at Toa Cultural University, travels to Izumo to investigate the ancient "Feather Robe Legend," where a celestial maiden is stranded on Earth after her robe is hidden. He explores a newly discovered iron sword inscribed with the Big Dipper, connecting it to myths of iron and Greek legends. His research leads him to uncover links between the legend and local traditions, encountering mysterious phenomena. Munakata’s colleague, Reimina Ikenotsume, assists him in navigating the historical and supernatural elements they encounter. Through his bold imagination and fieldwork, Munakata begins to unravel the hidden truths behind Japan’s ancient myths.