National strategy: I m familiar with this plot

Wake up Lynn found herself back at 18, sitting in a familiar high school classroom I thought it was the rebirth of the campus, but I didn't expect that it was a parallel space-time for the national strategy in this world, strategy has become the duty and obligation of citizens only by raiding the dimensional space can you be qualified to be a real strong man as an ordinary person, where should I go in the face of this crisis ridden dimensional space fortunately, the golden finger opens as long as you complete the selection of system strategy, you can get rich rewards however, just after Lynn decided to enter the dimensional space, he gradually felt something wrong... why does it happen here? It's all the story of the game he once played?