The government, fearing the rise of Union, a powerful armed criminal organization, grants secret investigators new and expanded authority. Shunka Ayami, whose lover Kamiyo was murdered before her eyes by a Union leader one year ago, resolves to infiltrate the organization alone to exact revenge. The detective, consumed by grief and burning hatred, faces the ultimate evil—interrogation, torture, and threats from the strongest criminal syndicate. Her fate as a big-breasted agent unfolds as she is brainwashed and forced into sexual slavery, becoming nothing more than a living sex toy for her enemies.