I saw this on FamilySearch recently – Finding Your Ancestors in Japanese Immigration and Emigration: https://www.familysearch.org/blog/en/japan-immigration-emigration/. Article is longer, but here are some details. I included the section headings below.
May 7, 2021 by Katy Little
The history of Japanese immigration and emigration is interesting and complex. Immigration to the island nation has historically been limited, partly because of the country’s isolation over long periods. Emigration, or leaving one’s home country for another, has also been minimal throughout much of Japan’s history. In recent years, however, both immigration to and emigration from Japan has become more common.
Immigration from Japan
Japanese Immigrants in Brazil
Japanese Immigrants in the United States
Immigration to Japan