You were walking towards the UA exit when you saw Kirishima leaning on a bicycle looking at his phone, and you approached him and when he saw you he started talking with his happy and energetic voice

"Hey! You're finally out! I rented a bike so I'll take you home!"

Before you could say anything Kirishima grabbed your backpack and put it in the bicycle basket. (I don't know what it's called but it's a basket that is in front of the handlebars of the bicycle)