Mamoru Tsuchiya is worried about the future of Japanese whisky.... The dollar value of exports to America grew by nearly 50 percent in 2019 over the previous year, according to the Distilled Spirits Council of the United States. But unlike most whiskey-producing countries, Japan has few rules about what constitutes whiskey, let alone what makes it Japanese.... Companies can buy spirits in bulk from abroad, bottle and label it “ Japanese whisky, ” and ship it back out....