Perhaps the Japanese People were the TRUE Chinese People?
After all, they - scholars, trained troops & maidens - descendants of a great People that built the Great Wall of China, ended floods upon the great plains, supported the 1st Emperor of China's great aims such as unification of territories, unified weights of measure & language, etc, etc?
While China's - thankfully, LONG historical records thru unified writings, since the reign of the 1st Emperor - had left records on the rise & fall of several successive dynasties, even the great Han, & eventually ruled by the brutal Mongols & eventually the equally atrocious Manchus, Japan had never tainted their bloodlines (DNA), & had even REPELLED invasions by the less civilized Mongols & Manchus over centuries....
However, it must be said, that the Japanese are a peaceful People, after the horrors of WW2, & had contributed to the growth of economies & scientific knowledge to Humankind, thanks to the great General MacArthur with Democratic foresight whom was a governor of Japan after the brutal WW2, who tamed them & show them a better way to live life & love, for innocent generations to come, & evident by the support of the Japanese People whom paid off WW2 financial compensations within a mere 7 years, that no county, not even Germany, were capable of....& led Humanity to better practices to achieve economic goals thru education & innovative trade?
Equally, it must be said - no homogenous society will be able to survive the long term, no matter the measures made even by the wise, proven with the frighteningly growing silver hair generations that saw even once thriving villages in the hinterlands of Japan abandoned.
Ultimately, Japan will need new blood, & it WILL be how immigrants - no matter white, black, whatever religions, etc, WILLINGLY ADAPTS to the traditions & culture of the nation that made it great & thriving. to FOLLOW the SAME to Make Japan Great Again..& in peace for Humankind's progress & evolution....something that sadly kind but DEI Germany did not do, & instead placed the nation in peril of uneducated but corrupted radical religious terrorist takeover, like many other nations in EU.,,even UK....