Marked for Mercy MM

A college senior has to fight to survive when her world is flooded with mana and invaded by fantastical creatures.
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This is a novel about an outside force invading Earth and forcing humanity to fight to survive with the help of a system. I intend to write it as a physiological story following the protagonist who is in a deep depression and finds hope again as the world is ending. There will be a romance plot that is central to the story but it only starts about halfway through so if you want that wait like a year.