Okay, I'm looking for a novel which has a particular element which is "enemy become lover". I'm not looking a pure full-blown romance novel, also not an enemy that teasing MC in every chance they meet. But, a novel that will present a really visible dispute between them. it doesn't mean, both of them at each other throat, one sidedly is ok. An example like A devil is a part-timer but less fluffy. it need to have a long chapter. and from the first appearance of the love interest we don't know that person will be the main love interest. and if possible not include harem.
This is a hard one....the closest I can think of is Limitless Sword God (though not quite similar to your req.)
P.s. I can't think of a single novel on this site where it isn't blatantly obvious who the love interest is, literally the moment a female is introduced it's either: 1. She's irrelevant and is going to disappear into the background 2. She falls in love with MC No third option
If you read PLIC you will know what I mean in Mizuzu's case. It's different, but you get what I mean from a seem like a 'mere' side chara (in case what I want is an enemy that will likely to be lose) well the second option you mention is, a result from clashing with MC... and the reason to falls in love is must be good too. ... well I am myself wondering, if there could be a novel like this