When a high school girl is reborn as Mary Bell, the villainess of her favorite story, she's cursed to continue speaking like her as well. Every word she utters sounds rude and cruel.
Still, Mary Bell decides to make the most of it and grows closer to her beloved main character and singer, Aria.
Taking knowledge from her previous life of idols and talent agents, Mary Bell helps Aria traverse a world of nameless tropes and mediocre male leads to become Beneath a Beautiful Melody's very first pop star!