Kirk here with some statistics on the 2020 population of non-Japanese in Kumamoto. The numbers from countries whose primary language is English are surprisingly low: just 370 from the US; I presume from the graph that other English-speaking countries are in the “other” category and have fewer than 51 (the lowest number for an individual country on the graph) living here.
The largest number were from Vietnam: 6239 in 2020. China and the Philippines follow. Another graph on the page indicates that the number for “trainees” (in issue we’ve discussed on the page) was 8,834 – the biggest category by far.