...I'm just going to second everything jedinat said, and then I'll throw in these:
Iono the Fanatics is about a queen who traverses Japan...looking for more girls to add to her harem. It's always portrayed in a humorous light, and barring maybe one or two instances, the whole
but we're both girls! trope is never played.
There's also
Kimi Koi Limit, and much like Kashimashi, is a straightforward love triangle. And unlike Kashimashi, doesn't have any fantastic circumstances.