[Daemonia]

It's also interesting to note that the real life Ishii was recruited by the US to 'advise' on their biological weapens programme and was granted full immunity from prosecution for war crimes. Who says crime doesn't pay, eh?

Arrested by the US occupation authorities at the end of World War II, Ishii and other Unit 731 leaders were to be thoroughly interrogated by the Soviet authorities. Instead Ishii and his team managed to negotiate and receive immunity in 1946 from war-crimes prosecution before the Tokyo tribunal in exchange for their full disclosure of germ warfare data based on human experimentation. Although the Soviet Russian authorities wished the prosecutions to take place, the USA objected after the reports of the investigating US microbiologists. Among these was Dr. Edwin Hill (Chief of Fort Detrick), whose report stated that the information was "absolutely invaluable", it "could never have been obtained in the USA because of scruples attached to experiments on humans", and "the information was obtained fairly cheaply". On 6 May 1947, Douglas MacArthur wrote to Washington that "additional data, possibly some statements from Ishii probably can be obtained by informing Japanese involved that information will be retained in intelligence channels and will not be employed as 'War Crimes' evidence." The deal was concluded in 1948. In this way Ishii was never prosecuted for any war crimes.

Richard Drayton, a Cambridge University history lecturer, claimed that Ishii later went to Maryland to advise on bioweapons. If Ishii did travel to Maryland, it was most likely to advise at Fort Detrick, a well known major biomedical experimentation facility in Frederick, Maryland. Another source says he stayed in Japan, where he opened a clinic where he did examinations and treatments for free. He was especially concerned with the health of children. In his final years he converted to Christianity. He kept a diary but it did not reference any of his wartime activity. He died of throat cancer at the age of 67.