[1] He retired from competition in 1934 following a harsh bout of clonorchiasis and a string of losses.

In the 1940s, Ushijima visited Beijing and competed in the local style of shuai jiao.

He fought first against famed practitioner Zhang Hongyu in a mixed match, hosted under shuai jiao rules but wearing judogi, in three consecutive rounds.

In the third and final, Hongyu captured the fatigued Ushijima's back and held onto him, ultimately throwing him with a double leg takedown from behind.

In 1944, he attempted to assassinate Hideki Tojo, a general and the leader of the Empire of Japan, but it failed.