Aoi discovers the body of Umezaki Wakana who came to Mochino Town for sightseeing.The body's mouth was filled with marbles.Led by Kasaka, everyone in the first department was searched and thought to be the imitator of the incident 16 years ago.But Aoi countered that the incident 16 years ago was a false accusation, and it was possible that the real culprit of the murder had not yet been caught.

At the same time, Aoi heard the truth about 16 years ago from Megumi, Amakusa, Momo and other partners in the Image Research Department.

Later, it was discovered that a man left the area immediately after Umezaki Wakana was killed.The look in the surveillance video looks very similar to Bupo.The investigation will be conducted under the sign of no breach.Aoi applied to the section chief, Taketo Ichijo, saying that she wanted to investigate the connection between Fuya and Wakana..

Ichijo allows Aoi to investigate, but only if he cooperates with Kasaka.As Aoi and Kasaka's investigation progresses, their suspicion of Fuwa grows stronger...!?