Aria (the childhood friend) didn't pull anything, in the LN it's the hero who tried to pull something by attempting to steal a kiss from her while they were on the balcony, going with the assumption that the hero should always get the girl and trying to make a fait accompli in front of everyone (that was Wazu saw), but she stopped him by socking him right in the kisser (punching him in front of everyone, served that creep well), unfortunately Wazu was already running at a ludicrous speed and turning his back to the scene when she did it...