[Sangetsu]

The proper way to become a permanent resident of Japan would be to get a 4 year college degree, and apply for a relevant job in Japan. If you are hired and sponsored for a visa, you have taken your first step. If you remain in Japan with the same employer for 5 or more years, pay your taxes, and stay out of trouble, you can try applying for permanent residency. YMWV immensely in this process. Some people get PR within 5 or 6 years, with others its taken 10 or more years.

The quickest way to PR is to marry a Japanese national. To to Japancupid.com, meet someone, and get married. You can usually get PR within 7 years after getting married.