Hara's son Nobuaki graduated from the Imperial Japanese Naval Academy just as World War II ended. When Hara was released from prison on April 19, 1951, Nobuaki took him home to a very small house in Tokyo. Hara dedicated the remainder of his life to securing Japanese government pensions and relief for the families of Japanese, Korean, and Taiwanese servicemen imprisoned for war crimes. Hara served as a Councilor of the Ministry of Justice (Japan) until his death at age 74 in 1964.