Ranmaru Shindo, five years after surviving the tragic Machida massacre, graduates from the Special Mobile Investigation Troops First Division training academy after he was recruited into the police force as a patrolman since the two Shindo siblings have joined the police force as part of moving on from what happened in Machida. During his transfer to the Shibuya precient, he encounters the red-haired woman in a police uniform who had been the sole cause of his nightmares and two officers, who are said to be elite officers from the TOKKO division. Ranmaru, with his friend and partner Ichiro Hanazono, investigate their first case of homicide with their superior Kaoru Kunikida after being indoctrinated into TOKKI when mysterious people began to attack the investigation team and their patrolman escorts with brute strength. It appeared that their sheer strength was about to defeat them for good. Ranmaru thought that he was about to die on his first day of duty as a TOKKI detective when the red-haired girl, wearing a black jacket and wielding a broadsword, arrives in time to battle the strange men and in fact, decapitates one of them holding Ranmaru by his throat

Sakura relieves her memories of meeting with Inukai and her sister prior to joining TOKKO. After TOKKO's clash against Gaki demons, Ranmaru receives an anoynymous call from a mysterious person who could provide him information as to the true reasons behind the events behind the Machida massacre years ago. During his investigation, he is suddenly attacked by a lone Phantom demon in the nearby park, specifically the 13th Phantom demon. Later on, he is saved by Sakura and her TOKKO comrade, Inukai when the two killed the 13th Phantom. In a conversation between Ranmaru and Sakura, she warns him not to continue getting involved in fighting the demons anymore. Ranmaru is left baffled by her strange warning. Sakura is left to believe, at first, that some people in the Public Security Investigation Agency were responsible for Ranmaru's appearance in the park

As Ranmaru continues to get deeper and deeper into the mystery of the Phantom demons, he is accosted by two strange men wearing shades and wielding pistols when he was strolling in a local park. To make things worse, Saya gets injured in a depicted hit and run accident staged during her break hours by an unknown vehicle. Ryoko and the others inform Ranmaru that a secret sort of cult society may have hired assassins to kill her when the TOKKO unit met Ranmaru in the old Machida apartment. In the subsequent fight, Akiha helps Rannmaru awaken his bond with his symbiote demon by stabbing him in the chest before pushing him into the open hole that he (and the other TOKKO members have seen 5 years ago) had seen in the Machida massacre. Ranmaru's awakened symbiote soon turned the tides in the favor of TOKKO when his symbiote defeated the demons in the area.

Ranmaru gets unofficially transferred to the TOKKO division while still being under the official command of TOKKI, which pissed off Kunikida and thinks that Akiha may have been responsible for Ranmaru's supposed transfer. In a meeting with the Phantom Countermeasures Committee, lead by top NPA (and possibly Public Security Investigation Agency) officials, they accuse Ryoko of wasting her time in their investigation against the Phantoms and not doing anything to calm the public about the supposed serial murder cases since Ranmaru's own symbiote was awakened by her subordinates without enacting on their authorization. In the dead of night, Gaki Phantoms infiltrate a NPA office in Tokyo in order to assassinate Ryoko in order to halt TOKKO's investigation against them. In the subsequent fight, Ryoko gets minor injuries on her left arm and they discover Ranmaru's power, which was the ability to channel his symbiote energy on his broadsword to do a projectile attack. Ranmaru, through Akiha, understood why Ryoko wanted to be in charge of TOKKO. It was for vengeance when her fiancée died protecting her from one of the Phantom demons during the subsequent Machida massacre.