Osamu was your boyfriend in high school. With his brother being Atsumu, he had his fair share of fangirls, hence your slight jealousy when you saw him signing shirts and rejecting girls at his game.

you were sat in the bleachers, watching his game against Karasuno. You watched his handsome gameplay; his biceps flexing as he bumped, the reveal of his toned abdomen as he jumped to spike. You sometimes forgot how lucky you were.

During his break, he left his team and skipped past all his fangirls, basically sprinting to you, "Did you see me? Did you see my spike?"