Government of Japan
The Current Emperor of Japan (今上天皇) is Akihito. He was officially enthroned on November 12, 1990. He is styled as "His Imperial Majesty" (天皇陛下), and his reign bears the era name of Heisei (平成). Naruhito, the Crown Prince of Japan, is the heir apparent to the Chrysanthemum Throne.
Reserve power
Unlike most other constitutional monarchs, the Emperor of Japan has no reserve powers. Following Japan's defeat in World War II, the emperor's role is defined in Chapter I of the 1947 Constitution of Japan, as decided by the foreign powers that had defeated Japan in the war. It states that the sovereignty of Japan rests with the people, not the emperor, and that the emperor is merely the symbol of the State and of the unity of the people.