in 2000, my adoptive mom and I traveled to Japan, I went to the City Hall of Records in the town my birth mother was born in (in this case, Sendai) On my behalf (it wasn't simple) my adoptive mom requested copies of my family tree, which listed, my birth mother (no father noted), her parents with birthdates, places of birth, etc. , her sibling(s) and any other children she had besides me. It also indicated that she married and immigrated. When a Japanese person leaves (adoption, immigration, death) the record is ended.
the person in Japan is Fuyuki Kyono . I'm trying to find a contact email. I think I got the contact here in these message boards...will keep looking!