Undercover agent Rei married her senior Kenichi three years ago. She has since reduced her workload to focus on home life and trying for a baby, but their failure to conceive and her husband's devotion to work have created distance between them. Then Kenichi disappears during a mission and stops responding. Fearing the worst, Rei traces his location, equips herself, and goes in alone. The site turns out to be a hideout for a notorious robbery gang. She confronts its members, only for them to take her husband hostage.