Tachibana suspects Okihara as a collaborator, believing that the person who murdered Nitta is the same person who killed Higuchi's wife. In the meantime, a 6-year-old child reports that his mother stabbed him.
Higuchi, who now has information on the actual suspect responsible for his wife's death, is attacked and disappears. Ishikawa rushes to the scene only to find that an unexpected person has Higuchi's cell phone.
After Okihara is attacked by someone, the suspect in Higuchi's wife's murder appears on the investigation timeline. However, Higuchi and Tachibana speculate that the real murderer is elsewhere.
Uesugi commits suicide. However, Tachibana doubts that it was a suicide. Higuchi and Tachibana wonder why Hongo's son, Shizuku, has not cooperated with a witness interview for the murder of Okihara.
