The 82-year-old Akihito in recent years has referred to his old age and admitted to making small mistakes at ceremonies, and the Imperial Household Agency has suggested reducing his duties, while giving more responsibility to Crown Prince Naruhito.
The NHK report, citing unidentified agency sources, said Akihito has told palace officials that he doesn't wish to cling to his title with drastically reduced responsibility or by arranging a substitute. Kyodo News agency carried a similar report quoting government officials.
The NHK report said Akihito has been mulling the possibility over the past few years and that his two sons have accepted the idea.
While such a step is unheard of in modern Japanese history, Akihito has broken with other imperial traditions.
More From This Section
He was the first emperor to marry a commoner, and Empress Michiko was the first who didn't use a wet nurse for their three children.
Akihito also surprised the nation in 2013 when he chose to be cremated upon his death, with his remains placed in a mausoleum smaller than those of his predecessors, with Michiko's remains alongside a plan that will break the imperial family's burial custom that lasted for 400 years.
Akihito has also attempted to soothe some of the wounds from World War II, traveling to China early in his reign and visiting major battlefields.
He visited the western Pacific nation of Palau last year, and the Philippines, one of Asian victims of Japan's wartime aggression, earlier this year.
Naruhito, 56, is his elder son and first in line of succession. Naruhito's wife, Crown Princess Masako, a former diplomat, is still recovering from a stress-induced mental condition.
The last succession from a living emperor was about 200 years ago.