This is a picture of a bond (20 yen) issued by the Japanese Finance Ministry (1942-1943).
I researched Japan a little more outside of class
and discovered that during World War II, Japans government issued war bonds using the Japanese Finance Ministry (Okurasho), and a couple others. The proceeds of these funds were used to fund the war effort. The Start of the Great East Asia War was launched, as we know it, with the bombing of Pearl Harbor and Manila as well as the Invasion of Malaya.