Originally an unremarkable Kansai citizen employed at the Seal Office, her life shifted dramatically after encountering Akudama criminals. Attempting to return a ¥500 coin dropped by the Courier at a takoyaki stand resulted in her arrest when she couldn't pay without it. During a chaotic prison break to rescue Cutthroat from execution, she adopted the alias "Swindler," falsely claiming high-level Akudama status with erased records to avoid execution herself.

She sported shoulder-length black hair with pink streaks, pink eyes, a black choker, a pink-and-white striped dress, black thigh-high socks, and fingerless gloves. Facing escalating danger from Executioners, she cut her hair short for practicality and later changed into a black sweater, white collared shirt, blue jacket, black shorts, and high boots, marking her transformation.

Initially naive and compassionate, she struggled to reconcile with the Akudama's violent world, often panicking in peril and offering comfort. A pivotal moment occurred during the Shinkansen heist when meeting siblings Brother and Sister. Developing a fierce maternal bond, she prioritized their safety above all else. This connection fueled her evolution: she killed human traffickers threatening Sister, demonstrating newfound ruthlessness. She later orchestrated city-wide chaos by falsely claiming leadership of an Akudama army, leveraging her infamy to create a diversion for Brother's rescue.

Her tactical ingenuity grew as she planned and executed traps, notably defeating the pursuing Cutthroat by severing his arm and stabbing him to protect Sister. Her story culminated in a sacrificial gambit: drawing Executioner attention while secretly broadcasting her own death. Portraying herself as an innocent civilian wrongfully executed, she incited public rebellion against the authorities, enabling the Courier to escape with the children. With her final breath, she smiled upon seeing a vision of the siblings reaching safety.