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The origins of the Japanese people is not entirely clear yet. It is common for Japanese people to think that Japan is not part of Asia since it is an island, cut off from the continent. This tells a lot about how they see themselves in relation to their neighbours. But in spite of what the Japanese may think of themselves, they do not have extraterrestrial origins, and are indeed related to several peoples in Asia.
We shall have to go back a long way through history and analyse in depth the genetics, culture and language of the archipelago and try to find out whether the Japanese are indeed unique, and in what way.
During the last Ice Age, which ended approximately 15,000 years ago, Japan was connected to the continent through several land bridges, notably one linking the Ryukyu Islands to Taiwan and Kyushu, one linking Kyushu to the Korean peninsula, and another one connecting Hokkaido to Sakhalin and the Siberian mainland. In fact, the Philippines and Indonesia were also connected to the Asian mainland. This allowed migrations from China and Austronesia towards Japan, about 35,000 years ago. These were the ancestors of the modern Ryukyuans (Okinawans), and the first inhabitants of all Japan.
The Ainu came from Siberia and settled in Hokkaido and Honshu some 15,000 years ago, just before the water levels started rising again. Nowadays the Ryukuyans, the Ainus and the Japanese are considered three ethnically separate groups. We will see why.