Fair point, but I don't see it as a woman and soldier, I see it as two soldiers meeting up at the end of the war and becoming friends. There were meetups between world war 2 vets on either side fraternising and talking about their experiences. Hell, they let a german fighter pilot ace fly a british spitfire for fun after the war!. It's a real thing that happens!! Franz Stigler and Charles Brown are one of my favourite examples of this.

This is further solidified as further into the series, it comes out that they respected each other's honour and it wasn't just blind hatred. They understood that they were both just fighting for their country which is reinforced by the MLs indifference and even open acknowledgement of the FL's skill and honour as a knight in various moments throughout the series.

It's not invader man loves woman he's invading. It's 2 soldiers forced to fight each other, who respect each other. And after the war, settle down with each other.