Безумный моб неосознанно разрушает сюжет ... - MangaLIB
Growing up in a family of warriors, Albert is forced to adapt to a life of combat from a young age. At the age of 14, he experiences a sudden realization: the world he lives in is nearly identical to a game he played in his previous life. However, there is a significant catch—Albert was never a main character or even a named secondary character in that game; he was a literal "mob" or background character.
The comedy stems from the disconnect between Albert's "ordinary mob" self-perception and the devastating reality of his actions.