a leaflet which resembles a Japanese money bill and included the message on the back was created. This money leaflet can draw the attention of people who find the leaflet and prompt them to read by utilizing human's natural characteristics which favor money. In addition, there was an intention to cause inflation in Japan by dropping fake money without such a psychological message for civilians. That fake bill was produced secretly Operation "Toy Horse" in California. These fake bills appeared in a Japanese newspaper. After the war, the US sent 1,150 people to Japan to search about the result of psychological warfare by leaflet propaganda. According to the survey, 49% of Japanese people answered that they saw the leaflet during the war. For the reaction of civilians, they did not care about leaflets from the US and they felt the contents of leaflets were childish at first. That can say early leaflet propaganda strategy by the US was unsuccessful. However, the result was starting to appear around the end of the war. The US dropped the leaflet which clarified the fact that Japan is overwhelmed by the US, the present predicament such as food shortage, and a fear of air raids. As a result, the worse the war situation was getting, the more Japanese people were affected by the leaflet. For the reaction of the Japanese government toward the leaflet dropped by the US, they showed much reaction according to Kiyoshi Kiyosawa who was a Diplomatic critic and journalist. Basically, the counterplan was settled after leaflets were dropped. The Japanese government issued the rule that people who find leaflets must submit it to the government. If the leaflet would not be submitted, the person was sent to the prisons for 3 months or had to pay a penalty. At first, 70 or 80% leaflets were submitted, but it was not reached 50% around the end of the war. As another government deal, popular persons announced the warning about leaflets in newspapers, magazines, and street speech. They said "do not read, do not listen to the US leaflet" to normal citizens. After a while, the Japanese government tried to spread fake information about the US strategy that the US military drops chocolates with poisons and pencils with bomb and they are willing to kill even children. However, there was no evidence that the US military dropped such goods, so it was