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.
Cabinet of Japan
In practice, much of the Cabinet's authority is exercised by the Prime Minister. Under the Constitution, the Prime Minister exercises "control and supervision" over the executive branch, and no law or Cabinet order can take effect without the Prime Minister's countersignature (and the Emperor's promulgation). While Cabinet Ministers in most other parliamentary democracies theoretically have some freedom of action (within the limits of cabinet collective responsibility), the Japanese Cabinet is effectively an extension of the Prime Minister's authority.
The members of the current cabinet of Japan headed by the Liberal Democratic Party lawmaker Shinzō Abe as of 2 October 2018 are as follows: