http://www.keishicho.metro.tokyo.jp/menkyo/menkyo/kokugai/kokugai05.htm
This metropolitan police webpage has English and other translations on the bottom. Please refer it.
I suppose you need to contact the local police or a local license center to make sure the place, office hours, etc.
But maybe you can find the information by googling "**県 免許センター" or "**市 免許センター".
The requirements and what you need to submit are the same all over Japan.
Good luck!