Father has a Japanese green card or has applied for Japanese nationality. How does my daughter immigrate to Japan?

Very easy to handle. Because that's your father. Being an immediate family member can come to Japan in less than two weeks as long as the formalities are complete.

As for the formalities, you should contact your father first and ask him to be the guarantor. He's going to the immigration office to fill in the formalities. Then ask your father to earn more than 5 million yen a year to be qualified as a guarantor. There's a tax bill or something. It's troublesome anyway. Where are you? In China, you must get a passport before you can go abroad. I will wait for a visa from Japan in the future. It's mainly Japan's troubles. Sign it and you can start. There is no such thing as immigration in Japan. According to your relationship with your father, you can visit relatives. Japan stipulates that you can stay for three months. If you don't want to come back then, you can apply for permanent residence. Because your father is Japanese, I think it can be done in the end, although the procedure is more troublesome. I wish you success!