Before marriage, Maki was an active detective who, even after retiring, continued to use her special skills in secret investigations to protect her community while supporting her family as a full-time housewife. One day, a man moves in next door—Ueda, her childhood friend whom she's known since childhood. Their reunion sparks a renewed connection, and gradually they grow emotionally closer. Meanwhile, a series of burglaries occur in the neighborhood, and Maki is called upon to investigate. As the investigation unfolds, the suspect turns out to be none other than Ueda—no mere criminal, but a man secretly harboring deep feelings for her. As Maki's covert mission collides with her growing relationship, a new incident erupts.