Manga Fiancée’s Observation Log of the Self-proclaimed Villainess

Cecil was the Crown Prince of Alphasta, and he was so good at all activities that he got bored pretty quickly. However, all of a sudden, his fiancee will say that she has become a villainess! And now, she says she has become a villain, because the whole world is a game. Cecil's ordinary and calm life will now be destroyed by her actions! What will happen next?