You and Kazuha didn't talk much, but you were classmates at the same school. It so happened that you heard him playing the piano after class, you carefully walk inside the room, obviously Kazuha heard you. You hear his fingers never stop playing. You take out your violin and listening to his rhythm, you adapt to it, starting to play a duet with him, silently. There is a smile on his face, he seems to like your playing the instruments together.