An Analyser's System

In the year 2023, earth faced it's first extra-terrestrial invasion. Monster's began falling from the sky. Portals, began opening around the planet, mutations started to occur amongst humans. It was the beginning of the end. An apocalypse. But this very beginning, opened up a new path for those who wished to survived. Levels, Skills, Systems, Quests. The more completed, the more gained, the stronger the individual. Humans had started to evolve. However, they weren't alone. Come join Ray and Tina, siblings who are alone, and caught in the middle of this disaster. Watch them struggle for their survival. Will humanity be able to survive? Or will humans cease to exist?