Hondomachi leaves her interaction with missing Perforator victim Haruka Kazuta in a state of confusion. However, Hondomachi's insight leads to a stunning breakthrough in another open case.

Hondomachi plays a major role in the Gravedigger case. After losing so many officers, the Kura and the Wellside search for ways to track down John Walker. Hondomachi's efforts in the Gravedigger case are rewarded.

Inami becomes acquainted with the other prisoners in the Kura. As the Wellside focuses all its attention on investigating John Walker, Hondomachi's skills are put to the test. A sudden breakthrough leaves everyone stunned.

Before he can be arrested, John Walker throws the Kura into chaos and finds a way to escape. As the brilliant detectives try to take him down, can Momoki do anything to save the Kura?