Responses
It was a bonus chapter at the end of a volume. When you see a .5, a .6, or whatever at the end of a chapter number, it's generally an extra short that was inbetween chapters in the tankoubon. These can be revisiting missed bits of earlier scenes (Uta and Kaoru talking at the inn) or they can be little comic relief shorts (Chloe throwing cats at people's faces) or sometimes they'll even be little snippets of the future.
I am confused. I thought we left off with the woman wanting to talk with her at the end of chapter 19. What happened?