In Japan in the near future, an infallible MRI scanner is invented that can scan the brains of dead people in order to visualize memories from their lifetimes.
A Tokyo Metropolitan Police Department special investigation unit commonly referred to as the “Dept.9” begins using the scanner in its operations. By analyzing images gained from the brains of crime victims, its personnel attempt to uncover the truths behind cases that were once thought to be unsolvable.
Rookie agent Aoki (Masaki OKADA) and his colleagues, who work under the Dept.9 founder and chief Maki (Toma IKUTA), are tasked with a new mission: they must visualize the memories of a man executed for murdering his own family, and also find his daughter Kinuko, who has been missing since the tragedy. However, the images extracted from the man’s brain show that the brutal homicides were actually committed by Kinuko.
The agents of the Dept.9 are astonished to learn the identity of the true killer. However, this is merely a prelude to the shocking events that are about to unfold.