Quick back of the envelope calculations:

Rougly 2 m^(2) of solar array, so 250 watts.

Maybe 250 wH/mile, so an hour of charging for every mile.

A very small battery for weight and cost, I’d guess no more than 10 KwH so 40 mile range with 5 days of solar charging.

Compare this to residential electricity costs of $0.11/KwH, $1.10 vs 5 days of charge.

Unless it’s somewhere with lots of sun and no electricity, I don’t see it.

“Japanese-based” is a good way to put it. The company is headquartered in Japan, but the cars are made in China and the management is Chinese. Chinese-made cars don’t sell well in Japan, so small Chinese EV manufacturers have started setting up automotive import companies in Japan to sell small Chinese EV buses to Japanese municipalities.