A suspicious letter arrives at Masako's house stating that she knows the truth about her daughter's case.... Sana is worried about Masako, who has been acting strangely since the letter arrived, and Masako slowly begins to tell her about the disappearance of her daughter Yukari 24 years ago. Sana, who knows of Masako's suffering, entrusts the suspicious document to Detective Ichinose and asks him to investigate. Kaori Moriyama runs into the snack bar "Tenshukaku" looking frightened. Kaori married her husband Moriyama, a company owner, six months ago, and they were living happily ever after. However, someone has been trying to kill her for the past month or so, and she asks Masako and the others for help, fearing that she will be killed if her situation continues.