Observation Records of My Fiancée: The Misadventures of a Self-Proclaimed Villainess

Originally published on Syosetu prior to serialisation. Crown prince Cecil was so brilliant that everything in life was easy to the point of boring him, then one day, his fiancée Bertia suddenly said "Prince Cecil, I am a villainess!" Claiming that this world is the same as that of an "otome game" f