Ryukyuan religion
He first began research into Okinawan history around the age of 50. After the end of World War II, he researched the native Ryukyuan religion, and produced a paper which drew great praise from Yanagita Kunio, widely regarded today as the father of Japanese ethnology. He would go on to produce a number of papers on topics relating to Okinawan history, "omoro", and ethnology, as well as a middle school textbook entitled .