This is the one isekai I've read where who they were in their past life is actually acknowledged very early on and made part of the plot. Very refreshing. What's also refreshing is that the characters communicate very well too - there aren't any silly misunderstandings and there isn't any drawn-out drama. The plot is all well-written and engaging, and the pacing is nice and steady too. While I wouldn't say it's the most original, it is unpredictable which makes it interesting and all the reveals throughout make sense.
While this story is more on the lighthearted side and doesn't delve too deep into any concepts, the author still does a good job of showing where each character's motivation comes from which then explains why they act the way they do.
There's lots of romance in the story - the lead characters express their love for each other fondly in every chapter. The overflow of sincere expression is really nice, IMO. That they trust one another and sincerely love one another is very heartwarming to see. It's also a source of character progression for the male lead, as he grows to be less possessive and more mature in love.
Biggest criticism for this story is probably that neither one of the leads has friends or a social life. There are a good cast of characters for the plot, and that's another plus. But, I personally like it when stories don't make the female and male leads each other's entire worlds, and this one does a bit.
Still giving this one a ten, because although it's not what I'd consider a masterpiece any means, if I want a solid lighthearted simple and straightforward shoujo with fantasy and romance this more than meets all expectations.
To address a review saying it'd be best for younger readers - I'm older than them so I think I actually passed on this one a couple times before because of it. There are a lot of shoujo scenarios I've outgrown, and while this was firmly in the shoujo category and I agree the characters you see at the beginning are the ones you get and they don't really get more complex or develop much more or anything, this story is still one that I was able to greatly enjoy. So, I'd still recommend giving the story a shot.