Oikawa is dressed in a uniform. A volleyball uniform he thinks, as he has a volleyball in his hand and there's a volleyball net across the gym.

He does what comes naturally to him. He throws the ball in the air, takes a few steps, arms reaching back as he leaps and then smacks the ball across the gym. It soars. Over the net, with such accuracy that shouldn't be possible. But it is, and not only is it possible it's easy.

Obtaining that skill wasn't easy. It was blood, sweat, and tears over the years that went into that serve. He picks up another volleyball. Time to practice.