The Emperor and The Female Knight

I found this in a list of "best isekai" but I'm on chapter 65 and I can't for the life of me figure out why it was on the list? It just seems like a historical story? There doesn't even seem to be any magic.

I'm still reading it because the story is good, but now that I'm getting further into it, I'm worried one of them is going to die and wake up before the pair meet.

If it is isekai/reincarnation, could you spoil it for me and tell me where that part of the plot actually appears?

https://preview.redd.it/mynxeorseu7h1.png?width=800&format=png&auto=webp&s=eef7027b28bc95498a432ca3b53029704367c62b