The most enjoyable aspect of this manga is when characters (such as Friedprawn, Yuu, and Tahara) will say something to the maou Kunai about feir intentions and Kunai will just go along with it, even without knowing what they're talking about, since fe doesn't want to look ignorant or out of the loop. In that sense, it reminded me of Overlord and Ecstas Online and maybe even Am I Actually the Strongest? It's a premise that allows for misunderstandings and miscommunications to occur. And as we all know, some of the best humor comes from characters misunderstanding each other, so there is potential for some good humor down the line. I don't think the story has actually capitalized on that humor very much as of yet, though. I say "as of yet" since there is a sequel that I assume picks up right where this story ended.
I am okay with Kunai as a character, mainly because fe allows for the humor mentioned above. I find Aku cute and I like the daughter-like vibes, especially once Yuu and Tahara enter the picture and notice Kunai's care for fem. I like Yuu and Tahara and the idea of building up a vibrant city from scratch. I also like Friedprawn Friedbutter and think feir political scheming and pragmatic-type nature could end up leading to some interesting developments down the line. But I don't really care for any of the three saintesses, or any of the members of the two adventurer parties, or Kunai's alter-ego "Zero," or Wotamega (of what little we've seen of fem so far). Several of these characters just seem to be there to be attracted to Kunai, and don't offer much else to the story.