The earth was facing an unprecedented energy problem. If there is a possibility of a solution, it is underground... Other than that, not everyone knows what's going on underground. 20XX year. Humanity finally ran out of resources, and the Earth itself gradually declined. While energy development efforts such as space exploration and underwater exploration failed to produce any significant results, humanity turned its attention to underground energy. In search of new energy, I also participated in a land price survey project. And they succeeded in capturing the life form they were looking for from deep within a cave in a certain primeval forest.
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