There are a number of groups that are working on returnee care and follow up. Our favorite is JCFN (Japanese Christian Fellowship Network).
Lonnie Dufty, a missionary in Japan, gave a paper, entitled “The Returnee in Japanese Society” for the 2000 Hayama Missionary Seminar that may be of interest to you.
Katsuhiko (Ken) Seino, pastor of the Tsuchiura Megumi Church in Japan, shared this paper at our 2005 RJC Conference,Challenges Ahead For The Japanese.
Other Helpful Lectures on Returnee Care:
Preparing Japanese to Return by Ken Milhous, Pastor of Boston Japanese Christian Church