Akari, an elite detective with the highest arrest rate, usually goes undercover to gather information at a soapland frequented by bad guys. While working there, she is asked to quit her job as an investigator when she gets engaged to her coworker's boyfriend. Meanwhile, Akari learns that a patch-type aphrodisiac that is more than twice as effective as conventional ones is being distributed, and she decides to finish her case on a high note and resign.