Jishou Akuyaku Reijou na Konyakusha no Kansatsu Kiroku. (An Observation Log of My Fiancée Who Calls Herself a Villainess)

Synopsis

Cecil Glo Alphasta's life is always utterly unchallenging. The heir to his father's kingdom, he is known as a genius in everything he accomplishes. However, nothing interests him until he meets his fiancée, Bertia Ibil Noches. On their first meeting, Bertia tells him they are inside an otome game, and she has the role of the villainess who interferes with the relationship between Cecil and the heroine. Although she proclaims she will fulfill her duty as a "wicked flower," Bertia's actions end up causing more good than harm. Intrigued by her behavior and deeds, Cecil decides he wants Bertia around and helps her behind the scenes. But with a fiancée like Bertia, the heroine might not be needed anymore. [Written by MAL Rewrite]