Hi Hiroshi, thanks for your order! It should take approximately ten business days to arrive. You will be the first in Japan 🙂
My Clover Mini Iron II is made for North America’s 120 V, 60 Hz power supply. Clover has a Japanese website, where you may be able to find more information, or at least contact information for someone who can answer your question better than I can. Here is the website: http://www.clover.co.jp/
If you have already purchased a North American style iron, you will probably be able to find an adapter to convert your local power supply to 120 V, either online or at your local electronics store.
Thanks again!