Akari, an elite investigator with a high arrest rate, believes that intelligence gathering is essential to catching criminals and constantly operates undercover. She is being urged by her boyfriend, who is also her coworker, to quit her job as an investigator following their engagement. At this critical moment, she obtains information about a new patch-type drug hitting the market—reportedly more than twice as potent as conventional aphrodisiacs. Determined to solve this case successfully, she resolves to use this mission as her final act before leaving the force.