Ayaka and Yurie are the ace female detective duo of the Narcotics Control Division. They are complete opposites in upbringing, personality, investigative methods, and even sexual inclinations, but their perfect teamwork has caught countless criminals. As they pursue the production and distribution route of a new type of stimulant, Katsura, the man to whom Ayaka gave her virginity, comes into their line of investigation. Ayaka is torn between her duty as an investigator and her rekindled love. Meanwhile, Yurie, who has been freely dating men following her carnal desires, has a fateful encounter and the footsteps of danger...