My Fate In a Story

In the world of a novel different from planet earth, there were ghosts that evolved and were no longer just paranormal things, they had become a real threat that devoured and ended the lives of humans, after this event humans also evolved to face the ghosts, but failed in the attempt and ended up being defeated unilaterally by the ghosts. Javier Lenz, a 22 year old university student, who had read the novel, was transferred to this world by a divine being who wanted to give a happy ending to this work, offering Javier a deal that would change his life and his fate.