Aryan is more than just skin pigmentation, eye colour and other physical atributes, its about what is on the inside.
I don't know if the Nuremberg laws would have forbidden relations between Germans and Japanese. They were aimed mostly at the Jews. They did not apply to relations between Germans and non-German Europeans. But I certainly do not know if they would have forbidden something like a relationship between a German and a Japanese.
In Japan the swastika got there by means of Buddhism and is known as the Meiji, if I recall correctly. The Jewish supremacists have been coercing the Japanese to stop using it.
The Nazis Believed Japanese came from Aryans, the Samurai means " those who serve in close attendance to nobility". In China known as Kanji?