The World Is Full Of Monsters Now, Therefor I Want To Live As I Wish

Story:

One evening, returning from work, Kudou Kazuto knocks down a huge dog. At the same moment he hears the voice "Experience points for the killed monster are credited to you." But he did not attach much importance to this. The hero does not even suspect that his life and the whole world have changed. The new world is filled with monsters, it has become like a game where the main goal is survival.