Article: If one of your parents was a Japanese citizen at the time that you were born, then you automatically obtain Japanese citizenship. According to Article 2(2) of the Japanese Nationality Law, if you are the child of a Japanese father, but your father died before your own birth, you immediately acquire Japanese citizenship. If you were born in Japan, to unknown parents, you have the automatic right to Japanese citizenship. This will occur if the baby is abandoned, reported as abandoned, or turned over to a medical facility or police officer.
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Have one parent who is a Japanese citizen. Have a Japanese father. Be born in Japan.