Ota-Onna, codenamed FlashTradeKiller and designated R12, is a 12-year-old hacker prodigy with cyan hair and piercing green eyes. Her viral creation, born from boredom rather than malice, sparked a global stock market collapse, catapulting her to notoriety and resulting in life imprisonment despite her age—a sentence underscoring her classification as a high-risk threat to worldwide security infrastructure.

Equipped with a razor-sharp analytical mind and mathematical genius, she breaches fortified systems effortlessly, altering or exposing sensitive data. She places unwavering trust in numbers over people, viewing them as inherently truthful compared to adult motives. This philosophy stems from a dismissal of communal values and responsibility, prioritizing her own insatiable curiosity above ethical boundaries.

Imprisoned in a remote facility alongside four inmates and a feline companion, her skills prove vital when navigating the compound’s concealed secrets during a sudden systems lockdown. While her recorded history emphasizes her technical mastery and emotionally detached perspective, her story centers on her legendary cyber capabilities and the cascading fallout of her actions before incarceration.