In the year 2041, mankind created their first space colony on the moon. But after a freak cataclysm devastated human civilisation on Earth, the republic of the moon built a domed megalopolis known as Eden. Now in the year 2267, a boy called Takeru spends his time engaging in hover-craft races against rival street gangs, unaware that he is about to embark in the journey of unearthing Eden's origin.