Hinako Shiratori reigns as the undisputed leader of Emperor High School’s delinquent hordes, her 16-year-old frame belying superhuman strength drawn from a peculiar source: the "Lucky Kitty" gym bloomers she’s worn since childhood. Adorned with a lucky cat charm, these modesty shorts amplify her power to tenfold human capacity—a force that evaporates if stripped of the garment, leaving her defenseless. Trapped at Emperor High after an illness derailed her academic prospects, she dominates its crumbling halls through sheer physical dominance and an aura of unshakable authority.

Her clashes with Ganpachi Chabane, a bio-engineered teacher bent on taming the school’s chaos, erupt into brutal skirmishes blending pressure-point strikes that paralyze limbs and scavenged weaponry repurposed for combat. Petrol-colored eyes glare beneath blue-black hair as she defies reforms, her 90-61-92 figure clad in Emperor’s standard green jacket and red bowtie uniform—or casual hoodies paired with pink shirts during fleeting moments of downtime. When battles peak, she armors herself in a trench coat slung over the Lucky Kitty shorts, prioritizing survival over propriety.

Rootless and solitary, her identity hinges on maintaining Emperor High’s anarchic ecosystem. No family or pets anchor her past; her legacy is written in defiance, a rebellion against control that paradoxically cements her as the institution’s most formidable guardian.