Scarlet El Vandimion, the daughter of a duke, has endured a decade of public humiliation and emotional abuse at the hands of her fiancé, Kyle von Pallistan, the arrogant second prince of the kingdom. Bullying her endlessly while parading other women around, Kyle believes Scarlet will remain silent for the sake of her family's reputation. He is wrong. At a grand ball, Kyle publicly annuls their engagement, accusing her of heinous crimes to justify his immediate betrothal to the baron's daughter, Terenezza. Condemned by the gathered nobles, Scarlet reaches her limit. She politely asks for one final thing before she is taken away: permission to respond.

When given the floor, she reveals the true nature she has suppressed for years. Known in her childhood as the Mad Dog Princess for her love of brawling, Scarlet is a master of hand-to-hand combat blessed with Chronokinesis, the power of time manipulation from the god Chronoa. Wielding this ability to accelerate her movements to superhuman speeds, she proceeds to deliver a brutal, cathartic, and bloody beatdown to Prince Kyle, his cronies, and every corrupt noble in the ballroom. This single act of violence shatters her ice-cold public persona and launches her into a new role as a rogue enforcer of justice.

The main character, Scarlet, is a powerful fighter who solves problems with her fists, preferring direct action over political scheming. She is fiercely protective of her younger sister, Diana, and deeply respects her older brother, Leonardo, the only person who could convince her to hide her true violent nature for ten years. Following the ballroom rampage, she gains the attention of the enigmatic First Prince, Julius, who is amused by her actions and recruits her to help root out corruption within the aristocracy. This puts her on a path that constantly crosses with Terenezza, the seemingly sweet new fiancée who is later revealed to be a cruel, power-hungry schemer and secretly a reincarnated person from modern Japan manipulating events to become the story’s "heroine."

The story is set in the fantasy Kingdom of Pallistan, a monarchy filled with stratified nobility, political intrigue, and a magic system based on divine blessings from various gods. The initial narrative arc begins with the engagement party, where Scarlet's rampage leads to Kyle being disowned by the royal family. She then enters the Royal Noble Academy, where she continues to use violence against corrupt nobles while being investigated by Prince Julius. Subsequent arcs involve dismantling a slave trading ring, embarking on a pilgrimage with Saint Diana that leads to a conflict with the rival Palmia Church, and journeying to the Vankish Empire, where she loses her time-bending blessing but remains a formidable fighter. Her journey escalates into uncovering a divine conspiracy and protecting the kingdom from both human and demonic threats, as she fully embraces her reputation as the noble lady who solves all her problems with exhilarating, heart-pumping violence.