For several generations Mars has been colonized by Earth thanks to a special enzime they have taken that has help them adapt to the artificial atmosphere that has been created on Mars, which has altered their appearance a bit but has become part of their culture. They still have the same type of DNA however. Now the citizens of Mars want independence, but Earth refuses to let them have it since most of their factories are on Mars. This sparks a "silent war" a between the two planets. Kable is just a young drag racer who is part of a drag racing gang with his group with his friends Edge, Monty and Fix. Eventually they meet a girl who has amnesia and a few mechanical parts. She can only remember her name, Mercy. We soon find out a group of rebels is looking for her, as well as Earth officials. So now they have to evade Earth officials and find out why the rebels want her.
