In 1927, he married a Japanese girl, and in 1932 he and his wife rented a flat in West Los Angeles.
On October 24, 1933, he left San Pedro on the Buenos Aires Maru, bound for Yokohama.
[3] While in Japan, Miyagi established a network of informants, which included a secretary to an Imperial Army general.
Miyagi translated Japanese reports and newspaper articles into English for Richard Sorge.
The Order of the Patriotic War (Second Class) was posthumously awarded to Yotoku Miyagi in 1964.