If you are looking for the vibe of your search phrase, here are actual, officially translated works that match perfectly:

(translated as The Berserker Mob Unwittingly Destroys the Main Story ) is a fantasy series following Albert Falcon, a reincarnated noble's son with memories of a past life in a world similar to a game. Plot Overview

I can prepare a review for Kyou Senshina Mob, Mujikaku Ni Honpen Wo Hakai Suru