Did the Japanese really immigrate from China before?

Japanese can't all be called Japanese. Divided into Japanese aborigines and later prehistoric immigrants. Today's Japanese are mainly mixed-race prehistoric immigrants and aborigines, or purebred immigrants. When there is no written record, the aborigines in East Asia generally live in two areas, one is the Yellow River area, and the other is between the Yunnan-Guizhou Plateau and the present Pearl River Delta. The local residents of Japan do not belong to these two systems, just like the dwarf fossils on the islands of Southeast Asia, which are branches of earlier humans. The aborigines of Japan arrived in Japan about 10,000 years ago. They have developed a simple cultural system and mastered certain tools. They also have a name, called "Xia Yiren". Immigrants migrated to the past near the time when writing was invented. These people are the ancestors of the vast majority of Japanese people now. After they arrived in Japan, they had a fierce conflict with the locals because of ethnic contradictions. As a result, a large number of aborigines died at that time, because the immigrants mastered the simple bronze smelting ability, and the immigrants were well organized and organized. Later, due to heavy losses, local aborigines began to integrate with immigrants and gave birth to the ancestors of modern Japanese. Later immigrants were far less than those in this short period, and there were not many cultural collisions. As for the Chinese characters upstairs. It is precisely because of the exchanges between China and Japan during the Sui and Tang Dynasties that the Japanese version of Chinese characters was born. Many words are different from China's. At the same time, it also directly led to a long time, and the Japanese were proud to be able to read the original Chinese documents. Accurately speaking, if we take the Chinese nation as an example, they are not immigrants from China, because the ancestors of the main part of their nation immigrated before the birth of the unique culture of the Chinese nation. Geographically, they are indeed a nation composed of immigrants from Northeast China, Bohai Rim and North Korea ... and can be counted as immigrants from China. Culturally ... they are amateurs from China. Because their writing is half Chinese and half Japanese. One of their most famous foods ... Sushi, formerly known as "Yi" (beside the word fish, which is not easy to read), was created by China people in the pre-Qin period. It existed in China until the Song Dynasty. In the Yuan Dynasty, due to the drastic cultural changes, this kind of food gradually disappeared in China. If you think it's not enough, you can keep asking. I will give you an answer as soon as possible.