Application forms and details (including the application timeline, age requirements and examination requirements for eligibility) are available on the Embassy of Japan website:
http://www.au.emb-japan.go.jp/itpr_en/education_mext_scholarship_en.html
The deadline for applications is Friday 15 June 2018.
Further inquiries should be addressed to the MEXT Scholarship Advisor at the Embassy of Japan in Canberra on 02 6273 3244 or cultural-application@cb.mofa.go.jp