 Prince Takeda held executive responsibilities over Unit 731 in his role as chief financial officer of the Kwantung Army.Unit 731 conducted biological weapons research on human subjects with a variety of bacterial cultures and viruses during World War II.According to Daniel Barenblatt, Takeda received, with Prince Mikasa, a special screening by Shirō Ishii of a film showing imperial planes loading germ bombs for bubonic plague dissemination over the Chinese city of Ningbo in 1940.