I mean I dunno if you can call it a harem. There are a few girls but they don't cling to him like some of the other Isekai stories with lots of girls. One of the girls (Filo) is a bit annoying but she grew on me after a while. Raphtalia is in love with the Naofumi but she's not really clingy. I haven't read this in a while so maybe a few things have changed. Anyway hopefully I was helpful
No! This manga doesn’t have any harems, ecchi or fanservice of any kind. The female characters are extremely lovable. And the mc is actually rather respectable and enjoyable despite everything that happens to him! There is a bit of romance however, but it’s definitely not the main focus. If you prefer watching anime, you can watch this online as it currently has a season out. But if you like reading manga then you can continue to read it here.

I'm reluctant to read this so Imma ask.. is there gonna be a harem or an annoying girl who will cling to thr MC? I'm not against polygamy what I hate about harem of girls is they're annoying like they illustrate them as annoying, flirty, tsundere and a bitch, etc.
I'd really hate it.. if it's gonna be like that coz it just doesn't sit well with me. ( ̄へ ̄)