Monster ga Afureru Sekai ni Natta node, Suki ni Ikitai to Omoimasu

On his way home from his office, the main protagonist drove and ran over a big dog. At that moment, he suddenly heard a voice inside his head. "The monster has been defeated, you have gained experience points." "Eh?" Before anyone knew, the world had changed. Monsters appear, this is a game-like world where levels, skills, and status exist. This is an adventure where the modern world becomes fantasy and where the main protagonist has to strive hard for his survival.

(Source: Shousetsuka ni Narou, translated)