Nagisa Tojo is a high school student who secretly commands a criminal syndicate specializing in human trafficking, arms trading, and other illegal enterprises. Ruthless and hands-on, she employs violence without hesitation to secure her ambitions. A fateful meeting at Miami Girls’ School sparks an obsessive vendetta against a peer, compelling Nagisa to devise intricate retaliatory plots—bounty placements, henchmen deployments, and occult rituals—to destroy her unwitting rival. Her target, oblivious to Nagisa’s malice, mistakes their confrontations for camaraderie, fueling Nagisa’s simmering rage.

Her vengeful spiral nearly ends in tragedy until her intended victim saves her life, abruptly fracturing her resolve. Consumed by remorse, Nagisa abandons retribution, pivoting toward reckless self-sacrifice to shield her former foe from danger. This duality—volatile enmity clashing with reluctant allegiance—erodes her identity as a merciless operative.

Affiliated with a nebulous entity called "the Organization," her precise rank and responsibilities remain unclear. Her privileged academic life starkly contrasts with her covert underworld dominance, embodying a fractured existence. Repeated defeats in her schemes, paired with the collateral fallout of her choices, weave a tale of fruitless ambition and accidental atonement, reshaping her path from predator to protector.