The story takes place in the middle of the 21st century when global warming has turned Tokyo into a tropical city. To reduce the temperature at the heart of the city by 5&deg;C (9&deg;F), the city is being reborn as the world's largest forest city. However, despite the flow of refugees to the new city of Atlas, there are not many residents who can actually live there. Moreover, anti-government guerillas are attempting to stop the forestation.


In the distant future, earthquakes and the effects of global warming have splintered Japanese society. Some struggle hand-to-mouth in the jungle-tangled ruins of civilization. Some live comfortably within the closed-off city of Atlas. Others lurk online, anonymously hacking the global economy. As nature grows more violent and the divide between classes expands, one spirited girl &ndash; Kuniko &ndash; must face her destiny and lead her people into the utopia of Atlas. The city's ruthless government isn't going to welcome them with open arms, but Kuniko won't give up until the gates of Atlas are kicked open for good &ndash; even if it means discovering that the promised land she dreamed of is built upon a foundation of twisted secrets and lies. <br><br>
(Source: FUNimation) 

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