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Aozora, a world governed by humans and technology. After global heating reached a critical level, humanity decided on a plan to give parts of the world back to nature. Thus began the production of massive forests that replaced small towns, and super cities that built vertically to house the refugees. Small towns still exist in this world, often by the shore, an ideal location to monitor both sea and forest. These establishments are connected by a vast monorail service spanning the whole of Aozora.