Researchers need to obtain a visa before coming to Japan. For researchers on an OCU fellowship, Osaka City University (OCU) will apply to the Japanese Ministry of Justice for a Certificate of Eligibility. After receiving this Certificate researchers can take it to the Japanese Embassy or Consulate in their country to apply for a visa more swiftly. Other researchers have to apply for their visa independently.
For information on how to obtain a visa, please see the website of Ministry of Foreign Affairs