Aoi discovers conclusive evidence against the real murderer in Ide's grocery store.

At this time, one of her classmates, Asuka Momo, appeared in front of Aoi.After learning the real culprit of the serial murder, Aoi was shocked.Tao admitted that all the murders were committed by himself.Aoi was pinned down by Tao on the electric shock rod and lost consciousness.

Kasaka was listening to the conversation between Aoi and the real murderer through Aoi's smartphone, which was in a call state. Suddenly the sound was interrupted and he noticed something abnormal happened to Aoi.When Kizaki and Natsume rushed to Ide's grocery store, Aoi had already been taken away.Kosaka called Ide, who was sent to the Metropolitan Police Headquarters, back to the Field Office to ask for clues about where Momo abducted Aoi.

Aoi wakes up and confronts Tao while being restrained.

What is the agreement that Tao told Aoi about 16 years ago? What is the truth of the 16th year that Aoi is pursuing?