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A demon is a purely spiritual creature. Their space exploration project sacrificed one-third of the population, spanned hundreds of millions of light years, and sowed the first demonic fire on the earth. It is now the year 362 when the artificial intelligence Cester has unified the world. The ghost octopus survives from a group of children with special powers. He received instructions from the super AI to prevent the all-out attack of the demon clan in three years. The fate of the demon clan, the survival of mankind, the restless world controlled by super AI, all the burdens now fall on this young man...