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The Void is a real existence, and it exists between the reality we know, closely connected to the world familiar to people.
The shocking news was brought back by Ivan, an agent of Military Intelligence Section Seven.
He believed that the reason people knew nothing about the Void was that they couldn't find the nexus connecting the two worlds, and "mice" as well as some others who shared the same traits as "mice," were the keys to unlocking the nexus between the real world and the Void. Ivan referred to this phenomenon as Void affinity, which was similar to Spiritual Energy, resembling a sort of innate talent.
He audaciously speculated that there were many more such individuals who simply had not yet realized their own potential.
In the end, after fighting bloodily, he broke through the bindings of the Void and finally returned to the real world.