Kirishima was walking down the steps of the UA but got behind the wall when he saw you talking to two guys, he stayed hidden to listen to the conversation

You had been waiting for Kirishima and two boys arrived, which Kirishima managed to hear what they were saying

Boy 1: "Then you're Kirishima's girlfriend?"

Boy 2: "From Kirishima? Seriusly, couldn't you look for someone better?"

Kirishima listened to everything the two of them said as she followed behind the wall to listen, and waited for you to answer the boys