On the day of the 24th Ward Gourmet Festival, Mari and the RGB trio have done everything they can to prepare to for the competition, but they find out that a quasi-gang organization called Yabusame, has bought up all of the cabbage that they were planning to use for their okonomiyaki recipe. Mari and RGB are at a loss for what to do, but their former teacher Kaba finds some cabbage from a friend at the local shopping district. Will Mari be able to overcome her obstacles to win the grand prize? In this dire situation, RGB receives a call again from Asumi...!

A tornado hits the Gourmet Festival, and Kaba and many others become victims when a decision is made by RGB. Someone going by the name of Carneades has hacked into the 24th Ward network and left a mysterious message. The trio have no idea who it might be. Meanwhile in the old Shantytown, a highly addictive drug called "D" has become popular, and crime is on the rise. Shuta hears that Kaba's daughter Kozue has been hanging out in this dangerous part of town at night and follows her.

Thanks to the KANAE system which has been in use for two months, the arrest rate has been going up. After Kunai's terrorist attack, Ran is now wanted as a material witness. Koki has been transferred to the department in SARG that operates the KANAE system. Meanwhile, Shuta has had a falling-out with Koki and Ran. His father Rui has gone to Paris to study, so he has been busy taking care of the Aoi Bakery. While he is struggling to bake the Golden Sunrise bread which is a specialty of the bakery, he receives an email from Kozue.

The KANAE system was based on artificial intelligence that was developed by Kanae, who was Koki and Asumi's mother. In the past, the same AI was installed on a vehicle that got into an accident leaving 0th and Tsuzuragawa injured. 0th is suffering from the after effects of this accident caused by the faulty judgment of the AI, and has developed dyslexia. Kanae racks her brains to come up with a solution, but is told that there is a fundamental flaw in her system. After hearing that 0th has gotten into graffiti, she gives up on development. The 24th Ward has been developing steadily, but after Kanae's death, the fate of the city changes drastically.

The KANAE system has frequently been producing errors. The cause of these errors were due to Asumi's consciousness being awakened inside the system, which confused the system when it was making decisions. Shuta is unable to decide what to do when Tsuzuragawa presents a trolley dilemma to save Asumi. Chikuwa arrives on the scene and they are arrested as terrorist suspects. Meanwhile, Ran and Koki are searching for "CMD," which appears to be the key to saving Asumi. Shuta reveals the truth behind the Takara Elementary School fire accident that killed Asumi.

When the RGB trio decides to go meet Asumi, they receive a call from her. Asumi presents to them a trolley dilemma that involves herself. They must decide between revealing Asumi's existence within the KANAE system which would lead to its collapse, or to fix the bug inside Asumi which would lead to everyone being controlled by the system. The trio are unable to make a choice between the two, and decide to go meet Asumi by any means. What is the future that RGB chooses?