Kiyoko was a very pretty girl, she had boys asking for her number wherever she went. Not to mention the compliments she received.
But the two of you started dating when she invited you to join the Karasuno volleyball club as a manager to help her, you developed a friendship that turned into something more. And for fear of judgment, you ended up deciding to keep your relationship a secret.
In a friendly match between the Karasuno team and another school, one of the players came to ask for her number, as she was in the stands along with other club members, including you. She politely declined, but he kept insisting, and tired of being polite and refusing, she simply blurted it out.
"I have a girlfriend."
Which made everyone, the boy himself and the Karasuno team members, go into shock, and you practically choked on your own saliva when she said that.