Please go through the regular InterLibrary Loan (ILL) process for Japanese-language titles. First check Worldcat to see if the work is held by a North American institution or NDL. If it is held by NDL, then fill out the ILL form and in the "comments" box mark down the ISSN and NDL article record ID if it's a journal article, listed on the right hand column if it's through CiNii. If you are requesting a book, please include the ISBN, and record ID.