A woman is reborn as Rebecca, the villainess of her favorite otome game. The game is divided into two parts. In the first part, Rebecca is fated to die, clearing the stage for the story to continue. The character she adored in her past life, her oshi, only appears in the second part. Determined to meet him, Rebecca decides she absolutely must survive until then. She identifies three specific death flags that lead to her demise and begins working to overturn them. To prepare, she starts studying magic independently and seeks training from a future great sage, a reclusive figure who once taught the game's final boss. She possesses considerable magical power but initially cannot use standard magical tools, a mystery that eventually reveals she has light-attribute magic, the mark of a holy maiden. This discovery adds a new and dangerous layer to her predicament, drawing unwanted attention and creating additional death flags. Her efforts to survive and protect those around her draw her into conflicts with powerful monsters such as griffins and basilisks, and she becomes entangled in political schemes, including a plot by a neighboring kingdom to use the royal prince as a puppet. Unbeknownst to her, her actions are attracting the interest of the very final boss of the game, the powerful and enigmatic Last Boss Duke, who ultimately proposes an engagement that will forever alter her carefully planned path to survival.