Toaru Kagaku no Railgun S Episode 16

is the sixteenth episode of the second season of the Toaru Kagaku no Railgun anime adaption, and the 40th episode overall. It was first aired on July 26, 2013.

The secret plan that was made to empower Accelerator has beesunk to the ground by the right fist of Kamijou Touma

Accelerator, the person which the secret experiment was built upon, is felled by the right first of Touma. Air, wind, atmosphere, all this was grasped by the hands of the Accelerator, all this through its vectors, to strike down Touma. All of this, is an attempt by the Accelerator to surpass being the "Strongest" and reach "Invincibility" at last, and in this, knocks Touma down.

As her surroundings tremble at the sight of Accelerator trying to achieve absolute power, Mikoto attempts to stop it herself, for she was the one who gave birth to this "experiment," and allowed this broken man before her to involve himself.――However, this would ruin Touma's plans in taking down the predictions of Tree Diagram by having the "Weakest" defeat the "Strongest."――

The only one who can stop this now are the "Sisters". With this, Mikoto asks for her sister, Misaka Imouto, to "protect his dream." Finally, it is come to the end Kamijou Touma and the Accelerator face each other once more for one final clash.

Major events

 * With the aid of Mikoto and the clones, Touma is able to defeat Accelerator.
 * The Level 6 Shift experiment is suspended, and the clones are sent to facilities for readjustment on their bodies.
 * Touma refers to Mikoto by her family name for the first time.

Adapted from

 * Toaru Majutsu no Index Light Novel Volume 03
 * Toaru Kagaku no Railgun Manga Chapter 038
 * Toaru Kagaku no Railgun Manga Chapter 039

Characters

 * Misaka Mikoto
 * Misaka 10032
 * Sisters
 * Accelerator
 * Kamijou Touma
 * Misaka 10032's cat
 * Index
 * Misaka 9982 (flashback-only)
 * Kusakabe Yumi (flashback-only)
 * Amami Eika (flashback-only)
 * Misaka 8912 (flashback-only)
 * Saten Ruiko
 * Shirai Kuroko

New Characters
No new characters were introduced during this episode.

Locations

 * Academy City
 * School District 17
 * Heaven Canceller's Hospital

New Locations
No notable locations were introduced during this episode.

Abilities

 * Accelerator (ability) - Accelerator, Level 5.
 * Radio Noise - Sisters, Level 2-3.
 * Electromaster (Railgun-variant) - Misaka Mikoto, Level 5.
 * Railgun (Unused)
 * Imagine Breaker - Kamijou Touma, Level 0.

New Abilities
No new abilities were shown during this episode.

Referbacks

 * Episode 4 is referenced a few times during this episode. First, showing the cookie mold that the girls bought in Seventh Mist being used for the cookies that Mikoto should've given to Touma, as well as the gatchapon machine after the end credits, showing Misaka Imouto acquiring a Gekota badge on her first try.

Quotes

 * Touma: "Grit your teeth well, 'strongest' one. My 'weakest' attack... might shake you up a little!"—to Accelerator.