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.
Kumazawa Hiromichi
In 1946-1947, Hiromichi was only the first of roughly nineteen men who put themselves forward as Japan's rightful Emperor. As a direct descendant of the Southern Court emperors of the Nanboku-chō period, he argued that Emperor Hirohito was illegitimate. He pointed out that Hirohito's entire line is descended from the Northern Court emperors. He produced a koseki detailing his bloodline back to Emperor Go-Daigo in Yoshino, but his claims and rhetoric failed to inspire anything other than sympathy.