Observation Record of a Self-proclaimed Villainess' Fiance

Lady Bertia, who's become my fiance, is a bit odd. On our first meeting, she proclaimed herself a villainess noble girl who's been reincarnated and said that she's working hard every day to become a splendid flower of evil that's elegantly put in her place. I don't get it. But she entertains me because I don't understand. That's why I think I'll observe her for a while. This is a story of a crown prince who's so talented and handsome that he's grown bored of his easy-mode life. A story of this prince observing a self-proclaimed villainess noble girl (who seems perfect at first but is a bit off) who's become his fiance as she snatches flags and breaks them into pieces.