Look at this with the twists and turns
We start out with a decent double bluff. Then it's starts to look generic only to reveal that we are indeed getting the culture clash that Isekai so often lack. Then the villainess is shown to instead of being a one note setup is a volatile mix of unpleasant and admirable qualities. Ending with flipping surprise possessiveness.
This has the potential to be a wild ride, om pleasantly surprised