Goro Nanase operates as a private detective for hire. His defining case begins when single mother Sayoko Toyama spots her ex-husband, Tsuyoshi Toyama, on a wanted poster. Tsuyoshi vanished after a tragic car accident claimed their daughter's life, an event that plunged him into despair and led him to abandon his remaining family. Now, three years later, he is sought for a double homicide under unclear motives. Sayoko hires Goro to find Tsuyoshi before the police, driven by her need to speak with him prior to his arrest. Despite law enforcement's unsuccessful manhunt, Goro takes on the difficult assignment. His investigation navigates multiple plot twists as he persists in pursuing leads, always focused on enabling the conversation between Sayoko and Tsuyoshi. This commitment highlights Goro's dedication to his clients' deeply personal needs, especially within emotionally volatile situations involving family trauma and unresolved grief. He must untangle the complex connections linking the past tragedy of the accident to the present violence of the murders.