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Miho works as an investigator, exposing herself to danger alongside her husband Ken. With a stronger sense of justice than anyone else, Miho is angry at the frequent underwear thefts occurring within her jurisdiction. However, when her section chief Hyodo orders her to take on a different mission, she disobeys orders and becomes a married woman living in an apartment complex to conduct an undercover investigation. She immediately captures a mysterious masked man who appears after stealing Miho's underwear, and when she enters the man's house to investigate further, another masked man appears...