Cool
Most probably a hollow fiberglass made empty shell. Look at all the windows of the car, all tinted black including the front windshield, plus no sunroof to hide the interior which is just an empty shell anyway. Serves its purpose well, its attracts your attention. Plus no liability even if it fell, it won't harm anyone..
Japanese are very careful people and don't take any un-necessary risks, when it comes to protecting their own and Developed world's (USA, Europe'people). Too bad, can't say the same thing about them, specially when it comes to them assembling sub-standard cars in 3rd world markets, with no safety features whatsoever (All Suzuki, Honda, Indus, products), but they charge them double, true Japanese way of business????