Arial and Arian were born in a suburb of Tokyo in 2030, with Arial the eldest by a few minutes.

The twins have never much cared for each other. Bitter rivals don't begin to explain the sisters' hatred, their childhood acting as one long household fight.

The twins were only 5 when the scientists debuted their anti-gravity vehicle in the Nevada desert, Arial and Arian had something in common for once. They were both intrigued by anti-gravity technology and desired involvement with it.