Fear The Reaper.

A man named Jack Ripper, named after a serial killer, his story started on a broken note. He never had much social life, instead occupying his time with fighting, he realized the thrill of fighting was what he loved. Later he enlisted in the military quickly becoming one of the best, he was selected for a special forces program, being turned into a living weapon. One day on the field of battle he found a book called, 'Dream Or Nightmare' he quickly became hooked on it, that was until an enemy soldier's grenade went off destroying it and him. He then woke up in the world of the book.

Heavy credit and thanks to @UnknownFate25 for the idea of this story, and the way the world works.