A young girl who is critically ill has spent the majority of her life in a hospital room playing otome games to pass the time. However, she one day finds herself in the middle of a scene from one of these games as Aileen Lauren Dautriche, the story's villain. At the banquet to celebrate the end of the academy's winter term, Cedric Jeanne Elmir, the crown prince and Aileen's childhood friend, publicly annuls his engagement to Aileen and declares his love for Lilia Rainworth, the game's female protagonist. Aware of her tragic future and determined to change it, the young girl resolves to defeat the game's final boss, the "Demon King," and Cedric's half-brother, Claude, by making him fall in love with her.