Good to know the story isn't actually this bad then and it's just the manga rewriting it.I don't know why the manga did things like that, in the LN it was very different. First of all there was no letter, they actually met the guy about Aisha's mom a few days before meeting the princess. Also the princess doesn't try to blackmail Nacht and the fight with Aisha goes a bit differently (no destroyed shoes for instance).