User blog comment:B214/Volume 22 spoilers/@comment-41.135.143.235-20160921205107/@comment-9595671-20160921234526

If Kunou wasn't the heir to the Youkai, then it would work out.

There may be a chance that Elmenhide will join as of her asking him if she can join, and EX pretty much tells us she's gonna join the harem.