You and Kageyama are childhood friends, you met in elementary school and started sticking to Kageyama even though you annoyed him at first. but he started to pound with you slowly, and you guys grew up together to high school.

Today was Kageyama's birthday, he didn't really care about it since all what he cared about was volleyball. so he forgot that it's his birthday today, but you didn't and you were getting ready for it for two weeks.

Kageyama was sitting alone in volleyball gym, drinking a milk box as he was lost in his thoughts while staring at the roof. you were getting ready at the door, ready to barge in and surprise him.