Japan did not surrender unconditionally in World War II, they made a demand that was disgraceful
In 1945, World War II finally ended, but when Japan announced its defeat, it was not unconditional surrender, they made a very unreasonable demand at that time, otherwise they would rather die than surrender, and even launch the "Jade Crush" plan to fight to the death with the Allies, and finally the United States agreed to Japan's excessive condition for its own interests, that is, to retain Japan's emperor system.
In fact, we all know that Emperor Hirohito of Japan was the one behind Japan's war of aggression, but he did not receive any punishment after the war, but continued to live a life of superiority, exempt from military trial, and even never made reflection and apology for the war, so it is very unreasonable for Japan to retain the emperor system, which also means that they have not realized their mistakes at all.
In Japan, the emperor is the descendant of the Shinto clan, so it is the spiritual belief of all the people, and every word and deed of the emperor is regarded as a holy will by the people, so when Emperor Hirohito preached the idea of militarism in the country, everyone was brainwashed, especially the Japanese women in order to be loyal to the emperor, there was no bottom line in doing things, and Japanese soldiers did nothing wrong on the battlefield.
After the United States dropped two atomic bombs on Japan, Japan was forced to announce its surrender, but it negotiated terms with the United States, and the reason why the United States promised Japan to retain the emperor system was that they could station troops in Japan and help Japan's economic construction.