The Heroine just HAD to be an isekai'd person, right?
I do wonder why the 'villainess' wouldn't have been aggressive as she had in the game though? It also appears she was doomed from the beginning though, since she had placed those progressive ideas in the prince's head, ones which the original Heroine would never of had.
Another delusional character that thought it's okay to steal someone's fiance.
Though then again, it's the royal family fault to spoil the crown prince and let him be idiots, and sacrifices someone for their own fault.