Modern Warfare: Gate to Another World

The huge dark door suddenly appeared, and countless powerful individuals emerged from the dark door. The powerful inhuman power destroyed the entire country H indiscriminately. Subsequently, it took a full year with the combined efforts of many countries to completely eliminate the species that invaded the earth. However, the huge dark door still stood there, so instead of defending, humans chose to attack. It was a magical world with energy and matter that was different from the earth. But what was more moving than this joy was that this world was enough to become a second planet for human beings. Of course, maybe the world that opened the dark door also thinks so.