i contacted embassy in Japan...this is what they sent me...
Dear Mr. Thornton,
Thank you for your inquiry. We are very sorry to hear that you have not seen your mother for such a long time.
Unfortunately, as Japanese law prohibits releasing information about Japanese residents without their permission, the Embassy is unable to do any research about your mother or her Japanese relatives. Furthermore, due to the U.S. Privacy Act of 1974, the Embassy is not authorized to give you information about any U.S. citizens without their express permission, so even if she actually is in Japan, we would be unable to answer questions about her unless she gave us permission to do so. We regret any distress this might cause you.
We suggest that you work with family members or relatives, if you are able, in order to locate your mother. You may also consider hiring private investigative services in the United States or Japan to assist you. Our Sources of Help webpage may also be helpful to you.
We hope that this information is of assistance.
Sincerely,
Consular Communication Unit
American Citizen Services
U.S. Embassy Tokyo
+81-3-3224-5000 (switchboard)
U.S. Citizen Services | Embassy of the United States Tokyo, Japan
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Subject: Forwarded mail through Embassy Web site