Emperor of Japan
The current Emperor on the throne is typically referred to as "Tennō Heika" (, "His (Imperial) Majesty the Emperor"), "Kinjō Heika" (, "His Current Majesty") or simply "Tennō", when speaking Japanese. The current Emperor will be renamed "Daijō Tennō" (, Retired Emperor), often shortened to "Jōkō" (), upon his planned retirement on 30 April 2019, and renamed "Heisei Tennō" () after his death and will then be referred to exclusively by that name in Japanese. In Japanese culture, it is considered a major faux pas to refer to a living Emperor by his posthumous name, although the posthumous name is the same as the era, which is used in official documents.
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.