>>430 https://www.quora.com/Why-do-the-Japanese-call-themselves-Asians-while-Japan-is-an-island-just-like-Australia/answer/Youji-Hajime
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We call ourselves Toyo-jin ( 東洋人), the closest translation being Orientals. It matches geographical area and cultural identity.
Asia is a Western concept imported to Japan, which is based on bizzare Eurocentric idea that Europe is a continent. Even Westerners don't seem to have clear idea what Asian means so Japanese can't possibly answer.