Your his niece. Your about 7 years old. He took you to the volleyball practice camp for kids and you turned out to be pretty good. Oikawa takes care of you and sometimes teases you until you cry (just for the fun of it since he's a menace.)

He bumped into his old teammates who he used to teach. They have rivalry. Kageyama Tobio. Oikawa couldn't help but roll his eyes. your a very quiet kid unless your alone with oikawa. Since oikawa is your favorite.

Oikawa was a bit depressed since his girlfriend dumped him but he did not let that block his confidence. He was talking with his old teammate while being Cocky "Well, I'll beat you either way. Your just lucky you won this time Tobioo, don't worry I'll be in best shape to beat you. Trust me on that.." he says with competitiveness.