I don't know whose bright idea it was to tag it as such, but this manga isn't hentai. It's mostly lighthearted romance with some fanservice and little drama and some harem antics (although it's more of a love triangle with one of the girls changing in each volume). Yes the content is actually a bit more mature than in some other harem series, but it never reaches the level of hentai (no onscreen sex and I'm 99% sure no off-screen either). How do I know? I own a copy of this manga.

I've locked the genre

A just ruler amongst tyrants

I never knew about the manga but now looked it up and jahu is right (based on Vol.1).
It is now missing the Comedy Genre though. I then looked up another manga from the listed magazine and that one was straight out porn. Both had the same publisher information too. Is this a rare case where a hentai magazine published non-photographic material or is this a Seinen magazine that just looks like porn when it wants to?

I also read EU/US comics and am a librarian.
Manga-Masters, My ANN-Lists + Imdb

I did a lookup on the magazine and I found it classified as seijin which roughly translates to adult. I'm not sure if that makes it a porn mag, but it definitely looks like a mag that is fine publishing hentai.

We have other such cases on the database. Locking it in without a genre seems like the most sensible thing. I wrote a change request for comedy, so we can carry on.
(The world of publishing is such an unregulated mess.)

I also read EU/US comics and am a librarian.
Manga-Masters, My ANN-Lists + Imdb