Ран, Коки и Сюта — три друга, которые не виделись с момента трагедии, произошедшей год назад. И вот после встречи на поминальной церемонии всем троим одновременно звонит одна из погибших...

Пока торговый квартал готовится к фестивалю еды, RGB-троица вспоминает, что произошло несколько лет назад...

Наступает день фестиваля еды, и Хироки Сиракабе — бывшему учителю RGB-троицы — предстоит сделать нелёгкий выбор. Впрочем, не ему одному.

Жители 24-го района переживают последствия страшного смерча, но над ними уже нависла новая угроза: наркотик еизвестного происхождения, сводящий людей с ума. Сюта, Ран и Коки, каждый по своей причине, отправляются в самую неблагополучную часть района — трущобы.

Ран узнал, что взрыв хочет устроить его друг Кунай. Он хочет найти и остановить его втайне от остальных, но Коки тоже взял след...

Сюта пытается найти Карнеада в одиночку , ведь ни Ран, ни Коки не выходят на связь, и попутно научиться готовить коронное блюдо своего отца — «Золотой рассвет».

Сюта задался целью лично поймать Карнеада и раскрыть его личность. И очень кстати новое сообщение с очередной дилеммой вагонетки посвящено именно ему.

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.

Tsuzuragawa is in a coma in the hospital after being saved by Shuta. While tensions grow between DoRed and SARG, Ran investigates what Tsuzuragawa was up to at Cornucopia. Ran meets with his mentor 0th, and hears about his new plan. Meanwhile, during the commotion in Shantytown, Shuta is unsure what to do. At that moment, he sees Kozue being pursued by SARG and goes after them.

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?