In a world choked by societal stagnation, where people constantly obstruct one another and enforce suffocating rules, a young girl named Mii appears as an agent of chaotic upheaval. Mii possesses a unique and escalating supernatural ability: the more she punches, the stronger her fists become. Rather than seeking to uphold any system, she dedicates herself to physically confronting every unreasonable person and unjust situation she encounters. The story follows her as a super-cute yet devastatingly effective hero who punches her way through the pervasive unfairness of modern life. Mii is not alone in her abnormal nature; she is part of a broader phenomenon involving individuals known as Battle Me Tants—humans who have been exposed to a mysterious light and gained strange powers. The true nature and origin of these Battle Me Tants, as well as the hidden agenda of the government that relentlessly pursues them, form a central mystery of the narrative. As Mii fights a succession of diverse enemies, she is hunted by state forces, suffers the loss of allies, and is eventually driven to a critical turning point. The narrative explores a blend of high-energy, chaotic action and deeper thematic layers, balancing cartoonish violence and cute character designs with questions about authority, freedom, and the nature of power.