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.
Prime Minister of Japan
To date, 62 people have served this position. The current Prime Minister is Shinzō Abe, who re-took office on December 26, 2012. He is the first former Prime Minister to return to office since 1948, and the 5th longest serving Prime Minister to date.