 After Emperor Shōwa's radio address announcing the surrender of Japan on 15 August 1945, he went to Shinkyo in Manchukuo to ensure the Kwantung Army's compliance with the surrender orders.With the abolition of the collateral branches of the imperial family by the American occupation authorities on 14 October 1947, Prince Tsuneyoshi and his family became commoners.Initially, he retired to his estate in Chiba Prefecture to raise racehorses, thus escaping the financial hardship many of his cousins experienced during the American occupation of Japan.