Spice and Wolf with macroeconomics and huge breasts.
The hero goes to defeat the demon king. After he learns that the stimulus from war has saved the human economy, he changes his mind and becomes her boyfriend.
My only complaint is: why does she have to have such huge breasts, and why do they keep shoving them in our face? It’s not attractive, in fact, it’s the only part of her that actually looks like a demon (oh, and the removable horns were hilarious).
Otherwise, I do like the female’s personality. Great flashback there. The hero needs some work, but we are just getting started.
The idea that war is justified by economic necessity is monstrous, of course (you could get the same stimulus through large, non-violent government projects) but I assume that with the young prince asking his questions, they aren’t going to let that idea go unchallenged.