In a fantasy kingdom where noble houses vie for power and corrupt officials exploit the common people, Scarlet El Vandimion, the young head of a powerful ducal house, has spent years suppressing her true nature. Known to high society as the Ice Rose, she has endured a decade of abuse as the silent, dutiful fiancée of the arrogant Prince Kyle, all to maintain her family's reputation. At a grand ball, Kyle publicly humiliates her with false accusations, breaking their engagement to pursue his new lover, Terenezza Hopkins. Scarlet, realizing her years of restraint have been for nothing, drops her mask and makes a final request. She asks permission to speak her mind, then proceeds to unleash her true self: the Mad Dog Princess, a brutal and skilled brawler who solves problems with her fists. She beats the prince, his new lover, and every corrupt noble in attendance, forcing public confessions of their crimes.

The setting is a European-style kingdom plagued by a Fantastic Caste System, where slavery and the exploitation of noblewomen are rampant. The kingdom's safety relies on the Diana faith, a line of divinely empowered Barrier Maidens whose magic repels invading monsters. The current Lady Diana, Scarlet's childhood friend Sanya, has had her powers stolen, leaving the realm vulnerable.

Scarlet is a noblewoman with a hidden passion for violence and a strong sense of justice. Prince Kyle is her arrogant and shallow former fiancé. Terenezza Hopkins appears to be a sweet, common-born otome game heroine but is in fact a brainwashing agent of chaos sent by a goddess to destroy Pallistan. Prince Julius is Kyle's brother, a smug and teasing gentleman who is secretly leading a task force against the corrupt nobility and becomes intrigued by Scarlet's power.

The narrative begins with the Ballroom Blitz, where Scarlet’s public beatdown dismantles the corrupt power structure in a single night. This act paints a target on her back but also catches the attention of Prince Julius, who recruits her into his secret task force. As she partners with Julius, their relationship crackles with Belligerent Sexual Tension. A major arc involves investigating the black market slave ring that Terenezza is connected to, where Scarlet uses her strength to extract information from criminals. The first major story climax involves Scarlet unlocking the power of Julius's Heroic Tale blessing, which runs on The Power of Love, forcing her to give him her First Kiss. Immediately afterward, she critiques his technique and punches him through the palace roof. The conspiracy deepens as they work to restore Sanya's powers and uncover the divine plot against their kingdom.