Toaru Kagaku no Railgun Manga Chapter 100

"Iron Wall" (鉄壁) is the 100th chapter of the Toaru Kagaku no Railgun manga series, was released on December 27, 2017.

Synopsis
The siege against the walls of the second reformatory continues with more of the participants attempting to perform an explosive breach, to no avail. Meanwhile, three members of a robotics club attempt to repel the security robots deployed against them. While they were able to swat away the standard guard robots, they struggle against the War Armadillo reinforcements.

Uiharu, Saten, Kuroko and Mikoto continue to think about their next plan of attack after witnessing the failed attempts of the other participants. With Saten's plan to scale the walls deemed impossible by a similar attempt by a nearby group and esper abilities still affected by AIM Jammer s, Kongou Mitsuko suggests launching massive logs while outside AIM Jammer range. At the control center, Kyougoku Ryouta is aware of Kongou's bold attempt and, despite his assistant's suggestion to use a more precise AIM Jammer, allows the attempt to push through, confident that his walls can withstand the attack. Indeed, the logs Kongou launched are blasted by a wind current generated from within the walls of the reformatory and are scattered across the field as Kongou loses control of her ejection points. As a last resort, Mikoto gathered a large amount of nearby metal debris and, while outside of AIM Jammer range, used her Railgun to launch it on the wall. While it easily punched a hole through the wall, they discover that pipes filled with Birdlime quickly close up the hole created by Mikoto's Railgun attack.

Although Mikoto is surprised at the convenience of Birdlime technology on the reformatory walls, she is distracted by Saten finally finding the missing pair of her paw-shaped climbing gloves buried under the iron sand and water created by her and Wannai Kinuho in an early clash against the guard robots. Saten then notices that the iron sand and water mixture solidified the former. This gives Mikoto an idea on what to do next.

Major Events

 * Large-scale attempts to breach the second reformatory's outer wall began. This involves the use of explosives and large projectiles launched by esper abilities used while outside the range of AIM Jammer s. Only Misaka Mikoto's attempt was successful, but even this was thwarted by the Birdlime technology used to quickly repair the damaged wall.

Characters
By order of appearance:
 * Kyougoku Ryouta
 * Misaka Mikoto
 * Shirai Kuroko
 * Uiharu Kazari
 * Saten Ruiko
 * Wannai Kinuho
 * Kongou Mitsuko
 * Awatsuki Maaya

New Characters

 * Aohoshi

Abilities

 * Aero Hand - Kongou Mitsuko, Level 4
 * Hydro Hand - Wannai Kinuho, Level 3
 * Electromaster (Railgun-variant) - Misaka Mikoto, Level 5

Locations

 * Academy City
 * 2nd Reformatory