I had a question regarding my koseki, I was adopted by an American family and removed from my japanese family's koseki. Neither me or my family have renounced my japanese citizenship, and was wondering if I have a koseki in order to get a japanese passport. I was told before that if you are removed from your parent's koseki then a new one would be created with just you on it, but wanted to make sure that this was the case. If I did have a koseki with just me on it, would I be able to retrieve it without my American parents' presence, as I have an expired passport with my kanji name, as well as my registered domicile.