"Okay, I was willing to give this a chance but- no. There are too many plot holes in this story. Like, a ridiculous amount. If this kingdom has the authority, when the second prince got injured, purposely mind you, by some guards under the weirdo duke, or whatever, why didn't his head get chopped off? Like, I'm not expecting this to be a 100% accurate story about nobles and shit but there's this thing called basic common sense. If you harm a member of the royalty, it's considered treason, and why did that megalomaniac king just let someone off scot-free? It's so OOC??? Someone who raised his hand against royalty, not even given a slap on the wrist, who purposely kidnapped a neighboring kingdom's princess to abuse because of some petty reasons... Not to mention, why is the Kalisto's head staying in this godforsaken kingdom?"
It's almost as if the second prince is in a politically weak position, that no-one knows the "princesses" origin (you know the central mystery of the piece) and that the head of the Kalisto's has a rank in both the kingdom and the Holy kingdom. Something that hasn't yet being fully explained is not the same thing as a "plot hole" e.g. when a murder mystery doesnt tell you who the culprit is until the end that isn't a plot hole.