After waking up from a nightmare, Iris realizes that she has been reincarnated as the villainess of an otome game that only has Merry Bad Endings. What’s more, the game is a brutal game in which if the heroine’s love affair is successful, it’s a Merry Bad End, but if it’s not, without exception the heroine is stabbed to death by the villainess. In this way, the younger brother who is a capture target grows into a major S torture bondage knight, and she herself will meet ruin as a rival of the holy maiden heroine. Moreover, in the worst True Ending, there is a possibility that the Royal Capital will go up in flames. I’m the villainess! No matter if you insist it’s the heroine’s happiness, I will stop the Merry Bad End! Iris decided. While folding her own ruin flag, as a villainess, she will prevent the heroine from getting a happy (Merry Bad) ending. While hoping for her brother’s healthy growth, and avoiding an engagement with the future confinement yandere prince, Iris decides to get in the way of the heroine’s love flag with the (potential) psychopath sorcerer who burns down the royal capital. But due to her actions, she was unwillingly made a rival of the Holy Maiden. However, becoming a holy maiden leads to an engagement with the prince. That is Iris’ Ruin Flag. She absolutely cannot become a holy maiden. That’s why, I’m the villainess! I’m not a holy maiden—!!