Mary Tachibana, an agent from the Narcotics Investigation Division's Special Investigations Unit 2, was tracking a shadowy organization manufacturing and distributing patch-type aphrodisiacs. One day, she obtained intel on the group's movements and attempted a solo infiltration of their hideout—but was captured. Bound and restrained, she looked up to find her superior, the division chief, standing before her. The shocking truth unfolds—her own investigative unit has been secretly collaborating with the criminal syndicate.