Reincarnated as an Office Lady with memories of her previous life, Tsubaki, once a 30-year-old, unravels a startling revelation from her half-sister about their shared recollection of being characters in an otome game. In this game, her half-sister was the beloved heroine, while Tsubaki found herself cast as the villainess noble who met a tragic end. Determined to rewrite destiny and prevent her mother's fateful demise, Tsubaki embarks on a mission to shield her mother and her cousin, the game's main love interest, from her half-sister's malevolent schemes.