An female assassin from the modern era transmigrates into a cheesy Western-themed fantasy otome game and needs to make the Demonic male leads fall in love with her in order to save the world. Bent on returning to reality, she begins to train the assassination skills of the evil second female lead, Lisa, in the hope that Lisa will kill her, but because of her stubbornly silly personality and various types of ambiguous physical contact, she's made Lisa fall in love with her?