Demon is the first book in the 'Survivors of the end' ('Sote') book series.  

After waking in a crater, being shot by a sniper, and being stuck in hospital. Pvt. William Miseral and 3 others are thrown into a hostile world overrun by a deadly blight that causes all dead to wake up and attack the living. And through it all this something watches. Miseral must try to find a way home while also dealing with the threats of Humans and Demon. 

Debut Novella by TheSlimeyBall

https://theslimeygames.itch.io/demon

until the 27th the book is 70% off!