One day, the protagonist of the story, an office worker and corporate slave, dies and is reincarnated in the world of her favorite otome game… But as the villainess Diana! And for some reason, Prince Sirius, who is supposed to end up with the heroine of the game, is being rather intimate with her! In order to prevent a bad ending from happening, which would lead to the world's destruction, she seduces him in hopes that he will be turned off by her impurity. However, instead of detesting her, it only makes him look at her with a more intense fire in his eyes. But they can’t end up together, otherwise it’s game over! It’s a sweet and sensual forbidden love story.