In the moon city Eden, children complete their compulsory education at fifteen and are then integrated into society as citizens of the city. But for that brief period of time in between, the children are granted a vacation of freedom. Just like many of the other youths, Takeru joins a race along with his friends -- a race using moon-unique machines called “Vehicles.” But unlike the other kids, Takeru has built his Vehicle with his own hands, and in doing so he ends up touching the truth about Eden’s secrets.