You were done with your volleyball training, the basketball group was already entering the gym to begin their.

As you headed to the changing rooms, one of the basketball team approaches you, just to then get hit by a flying ball, which makes him fall to the floor with a bleeding nose.

When you turn your head with wide open eyes you find katsuki, staring at the guy, then at you with an irritated expression, one hand on his hip.

"...she's my girl." he simply grumbles angrily.