Our situation

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To Izumosano,

I guess the FAQ from Tokyo will answer your question. In my opinion get married. I guess photgraphsa are not complex. You can have some photos with Kimono- well dressed/ May be at the city hall or you can take some of your friends and go to one Garden (I believe there are many in Japan) and take few photos.Since she is pregnant it is enough but they cannot see her for approving the petition (I-130). So photo will be helpful. Besides having apartments together okay.

You can apply for I-130 and get approved through the Embassy. Since you planned in August , I advice you to start soon. Once she get an immigrant Visa she will have six months to travel. Besides these days USCIS is slow with July and August back log.

Look this link. http://tokyo.usembassy.gov/e/visa/tvisa-ivfaq.html

FAQ

I am an American citizen resident in Japan with no intention of moving back to the U.S. anytime soon. Should I file an I-130 for my foreign born spouse anyway? Should we apply for an immigrant visa now?

We strongly encourage Americans and legal permanent residents based in Japan to file an immigrant visa petition for spouses and children if they think it is possible that they will want to reside in the U.S. in the future. The advantage is that if you are unexpectedly transferred or a family emergency requires you to return to the U.S., the petition is already on file and your spouse can stay behind and complete the immigrant visa application process without you.

Your spouse should NOT apply for an immigrant visa until you are ready to move back to the U.S. As the petitioner, you must complete an I-864 (affidavit of support) in order for your spouse to be able to apply for an immigrant visa. If you are not domiciled in the U.S. or qualified for one of the exemptions, you will have to demonstrate that you are in the process of transferring your domicile back to the U.S.