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Through blood heritage ?

Explain why the blood is needed. Is it perhaps because Japan uses a different type of oxygen that needs different hemoglobin?

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Dude ethnically Japanese people that were born in Japan, lived their entire childhoods in Japan, are no longer considered Japanese if they live outside of Japan for 5-10 years.

People who have lived their entire lives in Japan, but are not 100% ethnically Japanese, will literally never be accepted as Japanese.

I'm fascinated how little people know about Japan are seemingly the loudest in the room when it comes to deciding what Japan should do.

Because that is how they want it. What more of explaining do you need?

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