A young girl who is seriously ill has spent the majority of her life in a hospital ward, passing the time by playing otome games. But one day she finds herself in the middle of a scene from one of these games as Irene Loren D'Autriche, the villain. Cedric Jeanne Elmeier, the crown prince and Irene's childhood friend, publicly breaks off his engagement to Irene and confesses his love for Lilia Rainworth, the game's lead female character, at the banquet marking the conclusion of the academy's winter semester. The young girl decides to defeat the game's last boss, the "Demon King" and Cedric's half-brother, Claude Jeanne Elmeier, by making him fall. She is aware of the horrible future she faces and is determined to prevent it.