There were two that held the office for at least part of that year:
Fumimaro Konoe (July 22, 1940) - October 18, 1941
Hideki Tojo October 18, 1941 - July 22, 1944
Japanese Prime Minister Hideki Tojo from 18 October 1941 to 22 July 1944 ,
The Emperor ruled Japan.
Japan rules itself, although it has been ruled by others in the past.
Since japan attacked Pearl Harbor in Hawiia in 1941 and the atomic bomb wasnt dropped in Japan till 1945, there were no effects of bombs in japan in 1941.
Japan colonized us from 1941 to 1945.
Japan ruled Korea between 1910 and 1945.
Japan
Only China and Japan had ruled Korea
Britain never ruled Japan.
Only China and Japan had ruled Korea
toyko
Hirohito or, Emperor Showa ruled Japan for 63 years from 1926.