Aya Shiomi, a senior investigator at the Kanto Drug Enforcement Bureau, has hated sexual crimes since she was a child, due to the influence of her father, who was an executive at the bureau. Aya is caught by the "Sawaki Association," a group that distributes illegal sexual substances on the streets. Ironically, it is the first time that a sexual substance with a strong aphrodisiac effect is injected into her body, and her hidden masochistic nature is exposed... What will become of the trained investigator Aya?