Japan doesn’t have enough electricity. After Fukushima, they lost most of their nuclear. The country is densely populated, and the parts that aren’t populated are covered in forested mountains, which all makes building the required amount of renewables very difficult. So today and in the future, Japan runs on coal and natural gas. So they make cars that run on hydrogen (which is more efficient to create out of their imported natural gas than burning the gas for electricity) and then sell those abroad greenwashed as “but you can produce hydrogen from green electricity!”