Chiyo Fujishima (Yuki Katayama) comes to the detective agency of Souma (Eji Suzuka).It was a work request, but Souma, who had always disliked Chiyo, was not interested.However, thanks to the mediation of Urabe Kanoko (Matsumoto Honoka), Uma meets the client, Hisashi Mihara (Yo Kimiko), an acquaintance of the Fujishima family.Soon, Jiu came to the office.Zuoma, who was not interested at first, became interested the moment he saw Jiu put the commission money in front of his eyes, so he and Kanonoko accepted Jiu's commission.

Jiu took out the photo of his dead daughter Yori (Mikako Yoshida) and showed it to Uma and Kanoko.25 years ago, Yori fell in love with Ku's husband, scholar Yamaoka Otokichi (Kazuma Hamada).Jiu's husband was so angry that he kicked Otokichi out and immediately arranged for Yori to get married to another man.However, Yori eloped with Otokichi on the wedding day.Jiu wants to know the whereabouts of Yili, but Jiu's husband does not allow him to search for Yili.At this moment, Jiu's husband suddenly died of illness.While sorting out the study, Jiu found the documents on the investigation after Yori's elopement.According to the investigation report, Yori calls herself "Tsuruko Yamaoka" and lives in a small town.Jindai (Hatsu Okayama), a lawyer from the Minoru family, went to find Yori, but after the two eloped, Otokichi died of an epidemic, and Yori also died after giving birth to a child.

In order to find the child left by Yori, Jindai placed an advertisement in the newspaper, and Shiro Tokuda (played by Hamao Kitaka) and Satsuki Honjo (played by Kouta Nomura), who claimed to be Yori's only son, appeared.Jiu's commission is to let Zuoma see clearly who is Yori's real child.Kanoko, who knew the lie, immediately knew that Shirou was lying, but was worried about how to prove it to Kuzu and others.