Discussing about the emperor has been a taboo topic in Japan. People avoid having the imperial family as their chitchat topic because of its politicalness. In public space, showing your political stances and viewpoints towards the emperor could be dangerous. But after emperor Akihito's admitting of his Korean roots in 2001 and the approval that allows him to abdicate recently, what makes the emperor insignificant might not be his tabooness but the disinterest of the public.
The 125th Emperor of Japan - Akihito (83)
Precisely because of the many implicit associations of the Daisen Kofun and the intensity of the controversy over the origin of keyhole-shaped tombs, the lingering mystery of the identity of who interred in the tomb should be an intriguing one that people want to solve. The Imperial Household Agency's claim about the tomb has been withstanding until now might reflect that the emperor is treated with indifference.
The Japanese Government has approved bill which allows only emperor Akihito to abdicate, but rather than a legislation that would enable him and all future monarchs to relinquish the throne. Officials also quickly ruled out any discussion of a possible change to the succession law to allow female members of the imperial family to become empresses.
The wish of the “sacred” one has to be approved by the government could reflect that the emperor of Japan has been reduced to be a symbol of Japan, or merely a puppet from one that would be buried in a massive tomb in the past.
Emperor Akihito expresses concerns over health, age in a historic televised speech
After knowing more about the "airlike existence" of Japan, next part has a map showing you the large group of kofun in Sakai - the Mozu Kofungun, and a little virtual tour providing you an ordinary travelling experience of Japan