>>972405No, that's the other not-actually-an-isekai fantasy web novel with lots of gratuitous sex scenes, Redo of a Healer.
But if you want a harem, watch Monogatari. It's more of a pseudo-harem in that he gets a girlfriend in the first 4 episodes and none of the other girls are really in the running, but it follows a pretty standard harem structure where you have one male protagonist and a bunch of girls who all interact with him for various reasons, and each girl has her own arc, several of them flirt with or have crushes on him, etc.
But setting aside its qualifications as a harem I think it definitely satisfies the "above average visuals" part. Since you liked Nisekoi you should love Monogatari, both were directed by the same guy (Shinbou) and done by the same Studio (Shaft). Shinbou has a very particular visual style, and if anything it was very toned down in Nisekoi compared to Bakemonogatari. Part of this is that while Nisekoi is a manga series, the Monogatari series is adapted from novels which are very dialogue heavy, so Shinbou and his animators had sort of a free hand in deciding how to visually represent stuff and took it in kind of a creative direction. There's lots of abstract visual scenes in Monogatari that are just there to catch the eye, kind of like fanservice.
And speaking of that, that's another thing Monogatari is sort of famous for: it's fanservice. If that's a turnoff then you needn't watch it, cause it's totally unapologetic about it. The three pillars of Monogatari are fanservice, great visuals, and its stellar seiyuu cast having great dialogues with one another.
