＼(^.^)／NO Harem (Confirmed through novels)( ^-^)ノ∠※。.:*:・'°☆

This one is a bit tricky since it's an original work of the author. Since there is no novel hard to tell but I like this one and from what it looks like it's not gonna be harem.
I usually don't brother reading anything without a novel to state it's not a harem especially ever since I made the mistake of reading Nano Machine with out checking the novel. However I will give this the benefit of the doubt so hopefully doesn't disappoint.

https://www.novelupdates.com/series/second-life-ranker/

https://www.novelupdates.com/series/the-return-of-the-crazy-demon/

https://www.novelupdates.com/series/chronicles-of-the-martial-gods-return/

Haven't read it yet but it's completed and no harem
Usually is pretty accurate:
https://mangadex.org/title/0f13d05a-dacf-43ff-93ca-165523e55a46/the-live

https://www.novelupdates.com/series/my-daughter-is-the-final-boss/

https://www.novelupdates.com/series/leveling-with-the-gods/

https://www.novelupdates.com/series/omniscient-readers-viewpoint/

https://www.novelupdates.com/series/dungeon-reset/