So Zen and Ayame basically got exiled as an excuse for the "murder" of the prince's attendant... supposedly to avoid a war... that happens anyway.
Feels like a weak excuse for the MC to be a royal whose parents died pitifully far from their kingdom and in poverty.
Would have made more sense to have an actual elopement, have them lose the war or avoid the war altogether. Making them fight and win this war proved that all these efforts to avoid it were unwarranted. After all this, they could have just sent a messenger to tell them: "ok, you can come back: your exile is pointless now." As another commenter said above, they could have easily revealed that the "murder" was indeed a setup from the losing kingdom. Instead, they kept them banned for life, losing a great warrior and a princess in one move. And they only "forgive" them posthumously - and probably unofficially - when their OP child comes back.
Seriously, I kind of enjoy this manga, but I'll try my best to forget this chapter completely.