Do I have to go to Okinawa for a visa to Japan for more than three years?

Yes, for the first time. When entering the country for the first time, you must choose one of Okinawa and three northeastern counties (Iwate, Miyagi and Fukushima) to enter the country, and stay at least 1 night, and issue a proof of accommodation. After returning, you will be handed over to the travel agency that has signed a contract for you for three years and handed over to the Japanese Embassy for the record. It will be three years before it is really activated. After that, access will be unrestricted.

Japanese citizens can apply for a "three-year multiple-entry visa to China". Holders of three-year multiple-visit visas to Japan can travel to and from Japan for a maximum of 30 days within three years. Japan's multiple visas must not stay in Japan for more than 6 months each year.

If it is a family trip, the accompanying person must be the second-degree relative of the main applicant. Relatives get a "family visa" and can enter and leave Japan alone.

Baidu Encyclopedia-Japan Visa