@Kryomatics no u wrong. He wins the fight via any methods, nobles get mad at losing to a commoner and saying “he cheated, he used some dirty tactic that we couldn’t see, he blah blah blah”, the girls get attached to him, principle notices him and is either a old man or a busty or a loli woman, mc encounters different girls with those girls being tsundere, loli, shy, “emotionless”, and pretty much the whole point of the story cuz those girls will be the only reason why the plot is continuing rather than just a bland “peaceful” school life. After all, he doesn’t have a little sister to incest with so he’ll have to make do with other girls.
Also, he lacks common sense and probably brought a gun thinking it’ll be accepted as a weapon.