Kirk here with a screenshot of some survey results published in the Kumanichi (see URL below). According to the survey about half of the foreign “trainees” (jisshusei) and students (ryugakusei) in Kumamoto plan or hope to work in Kumamoto after their trainee or study period ends. Less than a quarter plan to return to their home country. I’m not sure how this compares to other prefectures but it makes sense to me – Kumamoto is a nice place to live and work.
P.S. I got this link from Ms. Yukiko Kaikita. I’ll be sharing more information from her about an event related to trainees soon.