Rekishi ni Nokoru Akujo ni naru zo - Vol. 2 Ch. 10

[Kaitensatsuma]

Making an economically collapsing nation a tributary won't be that profitable, unless you are just planning to bleed it dry, but that would inevitably lead to that country growing resentful and getting closer to your enemies, should the enemies be willing. If you know how to fix their economy, though, it could be profitable indeed, not to mention you would gain an ally. One nation fixing another nation's economy isn't that common, though, but this is a work of fantasy. A reincarnator could also use modern knowledge to do it. Maybe make that potato country Duran a giant of French fries, potato chips, and potato vodka.

Depends - using tributary status to begin an economic exchange while ostensibly acting as a protectorate isn't an outrageous idea: it would keep that other country on the backfoot and reconsidering their own invasion without sending resources one-way into the collapsed economy - though Liz is speed running the worst part of capitalism with her suggestion to make potatoes into the "tax crop" - just look at the Great Famine.
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Hey, who wants to take bets that Duke's grandfather is "Grandpa Will"?

 

[Smokeball]

It seems this is the crucial flaw for nearly every reijou stories. The villainess got hated by everyone, which supposed to be the heroine's role to take. I mean the ones in Katarina is make sense because that Cambel girl hated by nobles and people are licking Katarina's shoes. The villainess are supposed to be someone that got every cookies and the heroine is someone with empathy points from players.