I was your fiancée, wasn't I...

Mariabel Aria remembers being reincarnated into another world as the friend of a "villainess" in an otome game called "The Prince Who Fell in Love for Real"... and takes action to prevent her favorite villainess from becoming engaged to the prince. Instead, Mariabel became the prince's fiancée, and it has now become a weekly routine for her and her collaborators to gather evidence of the prince's infidelity and submit it to the king and queen without the prince finding out. Now then, according to the game, you who fell in love should break off your engagement with the villainess... but can you do it? ※This work's ending is yuri. And there is no condemnation scene.