He was the head of the Foreign Affairs Department of the Japanese administration in Hong Kong, from April 1943 to July 1944. (See pages 55-6 of Hong Kong Internment, 1942-45 by Emerson).
His name is mentioned regularly in R E Jones Diary (see "What links here" on this page), suggesting he was a regular visitor to Stanley Internment Camp.
John Charter mentions him in his diary entry for 5 May 1943:
During March Mr Hatori succeeded to the position of officer in charge of Internment Camps in HK and the New Territories, thitherto held by Mr Odah (or Otah). Mr Hatori had been an internee in an Australian camp, where he admitted quite freely to the BCC he had, with the other internees, received excellent treatment and accommodation and he was evidently taken aback by the conditions he found here.