In the future, after the human civilization ended by war and pollution, only those few people who had the power and technology escaped the disaster.
Those people built the last human city of Ecoban.
As its energy source is the pollutant, the people of Ecoban plan to destroy the inhabitants of Marr to get more pollutant.
Standing against Ecoban is a young man who wants only to clear the skies of the clouds to show the wonderful heavens to the girl he loves.