I can't believe people don't remember the fortune teller lady that appeared at least 3 times in the manga. She was introduced when Kogarashi and Yuuna were looking for clues about her past when they saw that photo of "her" human form in the wheelchair. The other time was with Nonko's brother (Jounosuke) attempt of forcing Sagiri into marriage and killing Kogarashi, she was the one who put Chisaki in the prophetic dream. This lady even said that she wanted to surpass Genryuusai and that her powers were still not close to it.
Now, she finally makes her move and was just poking in the story sidelines all this time. Just now we get to know that she is, in reality, a Tenko. It seems, from the looks of it, that she might be the final villain since this is the best time for her to fight Yuuna and Kogarashi won't be there too. Of course, the thing that no one knows is if she will help the group, fight them, or is just testing them again.