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A hundred years ago, in order to satisfy his ambition to become the co-lord of heaven and earth, the Demon King Rayaskaru led tens of millions of people to invade the continent of Sephibiat. The three races of humans, immortals and demons united together unprecedentedly to resist the invasion, and successfully sealed the Demon King in the abyss. However, a hundred years later, when the human world was in ruins, the Demon King quietly awakened again... With this as a background, the protagonist sisters embark on an adventure journey to find their missing grandmother. They continue to fight and grow along the way. However, as time goes by, the truth of their life experiences gradually emerges... [Upgrade Monster Fighting × Girl Development] The IQ of the two heroines is online, the word count is not bad, and the word count is not procrastinating. Readers are welcome to subscribe and collect~