DRAGON Arc

The DRAGON Arc is a major story arc of the Toaru Majutsu no Index series. The arc occurs in parallel to the events in the British Royal Family Arc, focusing on the happenings in Academy City's dark side. It continues on from the aftermath of the Battle Royale Arc, as Accelerator and GROUP try to track down the mysterious DRAGON, while Hamazura Shiage finds himself dodging assassins, ultimately finding himself in another confrontation with Mugino Shizuri.

The end of this arc, as well as the previous one, would immediately segue into the final arc of the Toaru Majutsu no Index light novels. In this arc, Last Order falls ill after the manifestation of Aiwass, the latter pointing Accelerator towards Russia if he wishes to cure her, while Hamazura escapes Academy City with Takitsubo Rikou by hijacking a supersonic passenger plane, eventually diving out above Russia, near the Elizalina Alliance of Independent Nations.

Depart
In the late afternoon on October 7th,  Accelerator received a job to kill Depart, a black market dealer specializing in services to help clients elude pursuit. Arriving at Depart's apartment in School District 15, he was mistaken for an interested client by Depart, who explained his services (and when it was brought up, a chained, beaten and mostly undressed 15-year old girl he had as a 'hobby'), not realizing until too late that Accelerator had come to kill him.

After slaughtering Depart, Accelerator called for a recovery crew to clean up the mess, ordering them to bring a set of woman's clothes and only have women on the crew, threatening to kick the balls of any men on the team. He then freed the bound girl and threw some bundles of cash, telling her to live freely from then on. When the girl asked who he was as he was leaving, Accelerator replied that he was a villain.

Aftermath
Later that night, Aiwass had a conversation with Aleister, using an ordinary cell phone and walking along the frame of a building under construction. After a short exchange about efficiency and value, Aiwass spoke about the mentality of Accelerator and Kamijou Touma, and then asked Aleister if he admired the two of them, talking about three different types of heroes and what drives them, remarking that they possessed something which Aleister didn't and saying that it wasn't surprising that he admired them since he was only able to fall and lament at that time. In response, Aleister warned Aiwass that he would use anything, Aiwass included, and that although it might find it amusing that there were errors in his plan, there was no guarantee that its superiority would last forever. Aiwass replied that it didn't possess power because it wished for it and that it would appear again when something else held value and interest to it.

After his defeat by Aiwass, the heavily wounded and bloodied Accelerator returned to Family Side and found Last Order exhausted due to the strain created by Aiwass's appearance. Yomikawai later woke before dawn, finding Last Order gone, a trail of blood leading to an open window and an unsigned note from Accelerator, shakily written in blood, saying that he would show that he could save the child's life. Slipping out of the city in a container on a freight train with the unconscious Last Order, Accelerator recalled Aiwass's words about how she would eventually break down and its advice to head for Russia and the Elizalina Alliance of Independent Nations if he wanted to find a way to save her. Crushing his cell phone and his only line to GROUP, Yomikawa Aiho and Yoshikawa Kikyou, Accelerator decided to go to Russia.

Around the same time, the Supersonic Passenger Plane carrying Hamazura Shiage and Takitsubo Rikou flew away from the city on autopilot. As they lacked the skills to safely land the plane, they had to jump out mid-flight with parachutes. After setting up explosives to blow up the aircraft and adjusting the settings to slow down enough to jump safely, the two parachuted from the plane above Russia, near to the Elizalina Alliance of Independent Nations.

At the same time as these two were heading to Russia, Kamijou Touma was also making his way there in order to defeat Fiamma of the Right and save Index, after Fiamma had stolen her remote control in the chaos of the attempted coup d'état in the UK and put her in danger.