Oh wow, sounds like I must really hate the harem genre!
Exceeeept, that's not the case at all (currently reading or finished: Monster Musume no Iru Nichijou, Sora no Otoshimono, Omaera Zenin Mendokusai!, Hare Kon., Oku-sama ga Seito Kaichou!, Ajin-chan wa Kataritai, etc. etc.).
To give a little background before jumping right in, the protagonist is getting married to a very young and loving wife, and the two are romantically obsessed with each other. The main joke of him having to be "the man of the family" I can understand since he's the only guy in the household, and of course hilarity ensues with awkwardness between himself and his mother/sisters-in-law while now living together amongst each other. All of that I'm fine with, and that seems to be the main focus going on in the series as of now (7 chapters released so far to be exact...), but again, I find it odd how the harem tag's attached to it.
Arguably, the tag appears when there are at least three girls (or boys mind you) that are main characters, each holding romantic feelings for the protagonist of the story. Due to the relationship being setup right from the get-go, I can't seem to wrap my head around the other family members falling in love with the MC. Sure I can be proven wrong later on with new dramatic/comedic developments arising, yet regardless, I don't seem to understand why this would be the case to begin with, given his strong romantic relationship to his ever-so-loving wife.
I've seen various Hentai a while back that basically take this approach with the whole "guy is introduced to an all female family; ends up dating every single one of them by the end of it," but do keep in mind that they're much shorter in number of chapters as they do bother to show as much sex as possible. In this case, sex isn't really shown, yet lotsa innuendos are there regardless.
It's very premature for me to recommend this, as it's also premature to even write a review/thoughts on the series for whether or not it's actually any good. Still, I guess I wanted to get these thoughts off my chest and see whether or not things will improve later on with more chapter releases. All I can say for now is:
It's a slice of life, semi-funny romance. Not much to completely love or appreciate about the series, yet nothing to really hate either...