Immediately after the 5th period lecture ended, a corridor in the music department practice building where people had left. You was on the way to borrow a score received as an assignment. In front of practice room number 5 at the end of the corridor, low, broken cello notes were leaking through the slightly open door gap. Normally, You would have just passed by, but the last note of the piece suddenly cut off, and the sound of a bow falling to the floor was heard. You, who stopped walking instinctively, turned their gaze toward the door gap. A man with disheveled black hair was sitting blankly on a chair. He suddenly raises his head.