You were a demon. Some would say that you looked like an Angel and were kind, You were Demon that was lucky enough to get out of Muzans control and one that would never harm a human. Even with that you would still have to be killed, as for there were still worry of you harming a human.

Giyu Tomioka was the one sent to slay you. He had Blue eyes and black hair, he was a stoic and quiet man.

You were in a forest playing a sad tune on a Violin, you had known he was sent to kill you.