The Japanese emperor has been hereditary for more than a hundred generations, so why does no one dare to grab the throne? It's not as simple as you think!
Japan's imperial system is the longest monarchy in history. Yes, it has reached 126 generations to this day, starting with the first emperor, Emperor Shinmu, and continuing until the current Emperor Naruhito. Some people marvel at the continuous succession of the Japanese emperor system, which has unexpected stability compared to the dynastic changes of other feudal dynasties. One wonders why no one covets power to seize the throne.
The early emperors were all based on legends, such as the legend of the first Emperor Shenmu in the 7th century BC, but there is no real historical data to verify. It wasn't until Emperor Tenmu, the 40th emperor in Japanese history, that there was really history to follow. So in this time period, it is not clear whether the emperor exists, let alone the struggle for the throne.
Secondly, there is no ability to grab.
From the division of the Western Zhou Dynasty to the unification of great Qin, for nearly eight hundred years, the princes engaged in it, from the beginning of the exercise to the war, to the end of the white in the red out of the desperate fight, most of the time their ideal is not to unify China, they just want to be the boss.
No one dared to stand up and say, I want to unify Huaxia, I want to destroy you all, I want to destroy Zhou Tianzi, I want the whole world to call me Daddy.
Because when he shouted like this, he was tantamount to making enemies with all the princes, and ordinary people really couldn't do it.
In the end, the emperor had no force and was not much of a threat
All in all, without the threat of external civilization, the Japanese have no internal incentive to spend a lot of money on political reform. It was not until American warships knocked on the gates of Japan that Japan had the Meiji Restoration, abolished the prefectures, and made political reforms. The emperor spent most of his time in Japan as a high priest and as a symbol of the spirit of the entire country, responsible for communicating with the gods of heaven and god, very different from the emperors of China. The Chinese emperor was a centralized, authoritarian, and representative of the role of heaven and heaven to legitimately rule the world.
In this case, the succession to the emperor's throne will presumably pay more attention to the inheritance of blood, and there will be no point in usurping the throne or anything. Even if you snatch this throne, which represents glory, not many people will admit it.