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In 2100, technology was already highly developed. As a nuclear bomb made by a little boy from the Internet in the Old Yuan world caused nuclear destruction of the world. The entire continent of the earth had already drifted from the original seven sections into three pieces. There were millions of islands scattered in the endless seas. There were only two large pieces suitable for human survival. The remaining land in the south was full of biological species distorted by nuclear pollution. Various poisonous snakes and beasts were scattered in the primeval forest full of ridges. Humans gave up the development and immigration of this land because they really couldn't get close. This resulted in two major management areas. Dongyi and Xixing.

After humans re-reflected on their own actions, a new era was born. In order to distinguish the old era, the new humans set this era as the new era. In the new era, humans strengthened communication due to the impact and fusion of mainland sections, and military forces were relatively highly concentrated due to the establishment of Dongyi and Xixing. Humans have developed more practical conventional weapons. Human life has also undergone tremendous changes. Due to the extreme consumption of resources, in addition to further accelerating the pace of exploring the universe, the focus of science and technology has shifted to daily life. Human life has become more comfortable and convenient on the basis of the old era, and more synthetic products are becoming more and more common.

The protagonist of our story lives in such a background of the times