"Yeah. But you heard what they said at school, it's probably nothing."

And sure enough, the next day the doctor confirms what Goda-san said- it's a muscle contusion, otherwise known as bruising, and Osamu will need to rest for two weeks, no volleyball. Osamu texts this information to Kita right away, not wanting to leave his upperclassman waiting.

Sadly, waiting is all that's left for Osamu. He waits for his back to recover, and in the meantime, watches Atsumu go to the National Youth Volleyball Training Camp without him. And it stings to lose this time to play with his twin, to meet the nation's best and show them up, to show off and test his own mettle.

The rest of the team can definitely tell that Osamu is struggling with being left behind. He shows up to practice out of habit but sits out with the managers, a thundercloud overhead the whole time.

Things finally come to a head in the club room after practice. A few first years are messing around, teasing one another, and one boy squirts another with his water bottle. A puddle forms on the floor as they have their fight, and Osamu sees red.

"Oi! Quit dicking around! You'd better be prepared to mop that up and not just leavin' it to Kita-san!"