Episode 4
Takeru and Biz speed through space in the emergency escape craft launched without Guidance Council approval. Kazuma, who was meant to fly with Takeru, was left behind to face the wrath of a very perturbed Guidance Council. When Takeru and Biz land on Earth they find it to be a little closer to what Eden had always told them it was: A great lifeless expanse of desert and devastation.
Aired 25/07/2007EP 4 - Episode 4
Freedom
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.
(Source: Anime News Network)
Note: Episode 7 has a runtime of 48 minutes.