This futuristic anime series follows 14-year-old Renton, who leads a boring life till a mecha -- piloted by a lass named Eureka -- smashes into his house. After Renton helps her get up and running again, he inexplicably finds himself stalked by the military. When the enigmatic Eureka takes him to meet an airship commander who fronts an underground anti-government movement, Renton is soon drawn into a web of intrigue.