Tatsuko-hime is a legendary figure from Akita Prefecture folklore associated with Lake Tazawa, said to have prayed for eternal beauty and been transformed into a dragon deity who now dwells in the lake's depths. She is venerated at Tatsuko Shrine on the lake's shore, where she is regarded as a guardian spirit of the waters and a symbol of enduring beauty. Local tradition holds her in reverence, though accounts of her origins vary across different retellings of the legend.