Responses
It was actually in a pretty recent chapters at least for me. But it was when she first went to da demon world and That's where they first met. She made a deal where she would go back to da human world and get his eye back, which she did. Azai was happy about getting his eye back and told her that if she ever need help, she can call upon him.
Wait I'm confused who is azai and when did she befriend him??? It's been so long since I read the story I don't remember him at all