The Constitutional Monarchy of Japan, known informally as South Japan, was the state the United States established on the Japanese islands from southern Honshu down to Kyushu, after World War II. The first emperor of the new state was Akihito, the teenage son of Hirohito, the last emperor of unified Japan, who was killed in the closing days of the U.S. invasion at the end of the war. Similarly, the Soviet Union established on the Japanese People's Republic (North Japan) on the island of Hokkaido and the northern part of Honshu, under General Fedor Tolbukhin with some Japanese Reds acting as his puppets.