Manthika

A story about finding your place in a reality that isn't just a game, building a relationship with other people, and solving mysterious twists to 'the original plot' that come up confusingly.  Slight political intruigue, in-depth chracter backgrounds, and just enough plot twists to keep you interested.  Funnily enough, despite the title, the main character does not truly seem all that troubled that her fiance is a villain. 

The negatives: the speech-bubble placement done by the artist are often terrible imo, though mostly only in the first book.  They tend to go a bit word-heavy in several panels and sometimes I got confused about which bubble belongs to which character or even which bubble was to be read first. 

The neutrals: some isekai cliche's (though it's hard not to have any as everything has been done, just about) but they aren't overdone. 
If you don't like political drama, like sometimes bordering on soap opera level, you might get annoyed

The slight SPOILERS: cliche 'isekai' sub-tags would include: not the only one reincarnated & future knowledge manipulation