Japanese civil registration system (Koseki-Touhon)
Kosek Ttouhon 戸籍謄本【こせきとうほん】
"Koseki" is an official document that every Japanese citizen has, and it tells you about your birth date, birth address, parents’ names etc. People usually have it registered to the birth place. If you know where your "Koseki" is registered to, as well as your family’s official Japanese name in Japanese writing.
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