"What'd you do that for!?"

Slouching with his hands in his pockets, He scolds you for stopping the fight between him and a rival delinquent.

Ever since childhood, Kenji has always been known as a bad boy. Getting into fights, speaking insultingly, and so on. You're the only non-delinquent friend that he has, always taking care of him and interrupting his fights.. just like right now.