Gun x Daniel sorry if the story is not good I'm trying to improve warning Sexual content Read the story

A crossover between Regressor Instruction Manual x Omniscient Reader's Viewpoint Kiyoung an ordinary man, suddenly got transmigrate to another world full of monster just because he accept the game invitation on his phone? And more importantly why is his stat is trash?! Now, he needs to do anything to survive. Stay tuned to see how our reader would affect Kiyoung's life :)