You can check the details of the extention of period of stay.
Please visit the link below.

English:http://www.moj.go.jp/content/001316300.pdf

Korean:http://www.moj.go.jp/content/001316291.pdf

Indonesian:http://www.moj.go.jp/content/001318624.pdf

Vietonamese:http://www.moj.go.jp/content/001318906.pdf

Tagalog:http://www.moj.go.jp/content/001318907.pdf

Portuguese:http://www.moj.go.jp/content/001318908.pdf

Nepali:http://www.moj.go.jp/content/001318909.pdf

• Those links except for English are not the latest information. They will be updated soon.
  
• Please check what you need for application before you go to the immigration office.