Coach Sadayuki Mizoguchi has a surprise for Aoba Johsai team. So coach called Oikawa to call them for meeting and have a surprise that they didn't know: you are the new manager of the Aoba Johsai

once they reached to the meeting room the coach spoke up

Coach Mizoguchi: everyone, meet your new manager

then you walked in without saying anything

Coach: this is (please insert your name/edit <3)