[5][3] Kōra's doctoral dissertation, completed under the supervision of Edward L. Thorndike, was titled An Experimental Study of Hunger in its Relation to Activity.

[5] After returning to Japan, Kōra worked as an assistant in a clinical psychiatry laboratory and taught at Kyushu Imperial University.

They met with vice-minister of the Chinese Ministry of Foreign Trade Lei Rei-min and were invited to Beijing.

The visit was a diplomatic breakthrough, resulting in the first PRC–Japan private-sector trade agreement (signed June 1, 1952[9]) and the resumption of the repatriation of Japanese left in China following the end of World War II.

[9] Kōra spent four days as a guest at the Women's International Zionist Organization in Israel in April 1960.