Description:

Meet Mary Albert, daughter of a rich and powerful duke. With her neat silver ringlets and impeccable manners, she’s the perfect young lady. But Mary harbors an unusual ambition—her own downfall! On the day of her school entrance ceremony, Mary realizes she’s living in an otome game she played in her past life. Not only that, but she’s the villainess, destined to torment the heroine, be expelled from noble society, and end her story in ruin. Most would do anything to avoid such a miserable fate, but not Mary! She cheerfully dives into the wicked role she was born to play, setting a course for catastrophe. However, not all goes to plan. Despite her best efforts to bully and harass the heroine, Alicia, the gentle girl seems blind to Mary’s intentions, even coming to see her as a friend. What must our villainess do to achieve her dreams of doom?! (Source: J-Novel Club)

Description:

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" from her past life and that she is playing the role of the "villainess" in it, she aims to play her part well and have their engagement annulled. With that goal in mind, she sets about causing turmoil in Cecil's daily life. (Source: MangaDex)