I am currently sitting for MEXT Japan Scholarship test for master degree. I have already had an acceptance letter from one university and just decided to try for another university as a safe option. There, I found one faculty member whose research fields match my research plan but he is an assistant professor. So, my question is that is it really a good idea to ask for an assistant professor who got his doctorate four years ago to be the supervisor. Yes, it has to be that university and that one professor is the only one whose fields match mine.
I hope for some kind replies pretty soon. Thank you!