Osamu's holding his body tight. Extra, extra tight. At first glance, it may seem like poorly restrained anger, and Osamu's sort of counting on that, hoping it will make his teammates leave him be. If they think he's just mad, especially if he can pin it on Atsumu, then maybe no one will notice-

A voice cuts through the inner monologue Osamu's delivering while digging through his gym bag. Kita's voice, which cannot be ignored. And he isn't asking an easily evaded question, either.

"Nothing happened," Osamu says at length, teeth clenched. "'M fine. Everythin's fine. Be out for practice in a minute."

He can't change into his gym clothes until the club room empties, just in case there's a visible sign of his injury plastered across his back.