There is this recent study from the World Bank:
What do we know about the Japan-Brazil migration and remittance corridor?
Junichi Goto, Kobe University, Japan
Since the revision of the Japanese immigration law in 1990, there has been a dramatic influx of Latin Americans, mostly Brazilians, of Japanese origin (Nikkeijin) working in Japan. The immigration of more than 250,000 Nikkeijin in Japan is likely to have a significant impact on both the Brazilian and the Japanese economies, given the substantial amount of remittances they send to Brazil. The impact is likely to be felt especially in the Nikkeijin community in Brazil. In spite of their importance, the detailed characteristics of Nikkei migrants and the prospect for future migration and remittances are under-researched. The purpose of WPS4203 is therefore to provide a more comprehensive account of the migration of Nikkeijin workers to Japan. The paper contains a brief review of the history of Japanese emigration to Latin America (mostly Brazil), a study of the characteristics of Nikkeijin workers in Japan and their current living conditions, and a discussion on trends and issues regarding immigration in Japan and migration policy. The final part of the paper briefly notes the limitation of existing studies and describes the Brazil Nikkei Household Survey, which is being conducted by the World Bank's Development Research Group at the time of writing this paper. The availability of the survey data will contribute to a better understanding of the Japan-Brazil migration and remittance corridor.