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In 1907, the advent of steam power and excessive use of it caused the air around New York to turn dark. There was an unexplained disaster called the “great disappearance“ 5 years ago and the government blocked off the city. Now, there's only one girl who walks in the ruins of the city: Elicia. Meanwhile, down below the ruins, Lily looks at the 'sky' which is stained purple. She doesn't have any memories, but she knows that she has a mission to reach the edge of the purple sky, Manhattan. A mysterious boy A
