Yoshiaki Kawano

Yoko Kojima loves zipping around Tokyo in her Daihatsu Tanto with its tiny wheels and pint-sized engine, but Japan's beloved 'kei cars' may have a rocky road ahead despite a legion of loyal fans.

Sales of the cutesy box-shaped cars, a staple of the world's number three vehicle market, drove off a cliff after peaking at 2.27 million units in 2014.