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Netherland...

In the thousands of years of civilization history in the mortal world, this strange world from another dimension has continued to harass and erode the mortal world. It has been a major concern for all living beings for many years.

Those evil gods from the Nether Realm covet the living souls of the mortal world. Although they cannot go to the mortal world to harvest them in person, they take the trouble to send more demons to the mortal world again and again... Tempting all sentient beings with evil thoughts to the path of corruption.

Once upon a time, mortal beings regarded the Nether Realm and the Upper God Realm as similar to the hell and heaven in Rhine's previous life.