 After the end of the war, Nishimura was tried by a British military tribunal in Singapore for the events related to the Sook Ching massacre.He was found guilty of war crimes, and was sentenced to life imprisonment, of which he served four years in Singapore before being sent back to Tokyo to complete his sentence.As he was being repatriated to Japan, Nishimura was forcibly removed from a ship at Hong Kong by Australian military police and brought before an Australian military tribunal on Manus Island, where he was charged with events in connection to the Parit Sulong Massacre.