Three years ago, Yayoi, a former guitarist, was institutionalized after she's detected as a latent criminal. As she anxiously waits for release so she can play the guitar again, she is approached by Kogami, who was still an Inspector, and Ginoza about a series of crimes occurring in the area she was once familiar with. She initially rejects their offer until Kogami gives her some guitar strings which reminded her of a guitarist she admired, Rina Takizaki. When the club they are investigating gets set on fire after Kogami's Enfocer partner Mitsuru Sasayama jumps the gun in approaching culprits dealing with Molotov Cocktails. Yayoi decides to search for Rina, only to discover she is part of a resistance group selling the Molotov cocktails in the hopes of overthrowing the Sybil System. Yayoi tries to stop Rina but finds she is unable to use the Dominator that Kogami gave her, as she was not actually an Enforcer yet, and Rina escapes. Afterwards, Yayoi resolves to become an Enforcer and leaves the rehabilitation center.

A man in a helmet breaks into a pharmacy, kills the staff, and departs with drugs. When the MWSPB arrives on the scene, they find his Crime Coefficient was not high enough to set off the alarm. The same man attacks a woman in public, brutally beating her to death with a hammer in front of a crowd and a Psycho-Pass scanner. Later, the team learn that more culprits, wearing the same helmets, rob an armored car. Kogami deduces that the second crime would have a motive, leading their investigation to a man named Jyunmei Itoh who had a grudge against the victim. As Itoh attempts to escape, Kogami deduces that the helmets copy the low Crime Coefficients of innocent bystanders, thus help criminals avoid apprehension. With Akane and Masaoka's help, he apprehends the murderer.