Eight wins and one universe, that is, to complete the mission of "conquering all directions of the world and putting it under one roof", that is to say, because "Japan is a god country" and "the Japanese nation is the best nation in the world", the whole world will merge into a big nation and form a big country, that is, a world, enslaved by a country and ruled by a Japanese emperor.
China's immortality is easy to understand and needs no explanation.