Out of the 6 girls in the meeting 1 wants it, 1 thinks they should think about it 3 is quite possessive, and 1 didn't give clear answers but seems to lean to the "No" side...
well, there is still a chance! GO OBORO! Continue to pursue The Dream!
@Vasqueztion As snakeyes put it, he's powerful enough, the yokai world might actually expect him to have a harem, but human society would not look kindly on the situation, because they're kinda prudes on the whole polygamy situation. The solution would be to have one of the girls be his "legal" wife for the purpose of documentation (in which case, Chisaki, Sagiri, or Hibari would be the optimal choices, since they're likely the only ones with actual, legal existences) and the rest just be "friends" that live with them; after all, they do live in an old inn that's been converted into a dormitory, so it wouldn't be that strange.
The important thing is that the main heroine Yuuna seems to be ok with the idea. We have precedents when the main heroine's support was the decisive factor in achieving the harem.