Influenced from a young age to bully her saintly, noble stepsister Mielle, Aria Roscent lived her life wickedly, ultimately paying for her misdeeds with her head. But right before Aria's execution, Mielle reveals that she was the one encouraging her own bullying behind the scenes to force Aria out. When Aria wakes up as her teenage self thanks to a mysterious hourglass, she has just one goal: bring Mielle to ruin. Can this villainess out-villain the one who turned her wicked in the first place?