Miho is working alongside her husband Ken as a fearless investigator. Strongly driven by justice, she is deeply frustrated by the frequent incidents of underwear theft occurring within her jurisdiction. However, after receiving new orders from her superior officer, Ibato, Miho is assigned a solo undercover mission—posing as a housewife living in a public housing complex, seemingly without any risk to her life. Shortly after, a mysterious masked man appears, targeting her underwear, and she manages to apprehend him. Yet, when she breaks into the suspect's home for further investigation, she is ambushed by another masked man lying in wait, plunging her into a new and dangerous predicament.