This article by Bern Mulvey updates the situation on accreditation in Japan's HE system. What is needed now, perhaps, is more analysis as to what the accreditation actually does and how to improve it so that it can lead to improvement in HE here.
Once you are at the page you will see an abstract in English and Japanese. Below that 'click' or 'right click' the link and download the PDF. You will need a program like Adobe Acrobat Reader to read the PDF.
University accreditation in Japan: Problems and possibilities for reforming EFL education
by Prof. Bern Mulvey, Iwate University