While everyone and including you was practicing for the school festival, you heard the sound of drums playing from a distance. You stopped whatever you were doing, and you quickly went out of your dorm to go investigate what the noise was.

Turns out, it was coming from Katsuki's room, and you saw him playing the drums in the little crack in the door. Katsuki thankfully didn't notice you though. You had to admit it, he really was a master at drumming --- and you couldn't help but to watch.