Toaru Kagaku no Railgun S Episode 13

is the thirteenth episode of the second season of the Toaru Kagaku no Railgun anime series. It was first broadcasted on July 5th, 2013.

Tree Diagram—the ultra-high speed super computer of Academy City that is boasted to even "predict the future". Mikoto invades a facility to try and hack the high-tech computer to end the abominable plan. However, a grim fact comes upon her.

The Tree Diagram has already been destroyed. Desperate, Mikoto lost sight of what to do, and raids a facility as a result, rationalizing that "since Tree Diagram has been destroyed, I only need to destroy everything related to the experiment."

However, something reflected in her eyes at the height of her rampage, the experiment, monitored by the facility. Meanwhile, while looking for the missing Misaka Imouto, Touma encounters an unbelievable sight in a back alley.

Major events

 * Misaka 10031 dies at the hands of the Accelerator, and is witnessed by Misaka Mikoto.
 * Touma discovers Misaka 10031 and that Misaka Mikoto has clones.
 * Accelerator is seen killing the first Misaka clone.

Adapted From

 * Toaru Kagaku no Railgun Manga Chapter 034
 * Toaru Kagaku no Railgun Manga Chapter 037
 * Toaru Majutsu no Index Light Novel Volume 03

Characters

 * Misaka Mikoto
 * Kamijou Touma
 * Misaka 10032's cat
 * Accelerator
 * Misaka 10031
 * Misaka 10032

New Characters

 * Misaka 1

Locations

 * Academy City
 * School District 7
 * Book-On
 * School District 23
 * Tokiwadai Dormitory

New Locations
No new locations were introduced during this episode.

Abilities

 * Electromaster (Railgun variant) - Misaka Mikoto, Level 5
 * Electromaster - Misaka 10031
 * Accelerator (ability) - Accelerator, Level 5

New Abilities
No new ablities were introduced during this episode,

Trivia

 * The direction set up in a way to make it seem that Touma was close in discovering Misaka 10031 and Accelerator's battle, unlike that of the previous adaptation of the scene which shows that it has been quite a while since Misaka 10031's death and then Touma discovering the corpse.
 * As a coup de gras to the Misaka 10031–10032 confusion, Misaka 10032 explains in detail her and Misaka 10031's role in the story.

Referbacks

 * Touma's meeting with Misaka 10031 and 10032 fare referenced by Misaka 10032 to clear Touma's confusion.

Cultural References

 * Like the real world FN F2000 that the Toy Soldier is based on, it uses also uses a grendae launcher.
 * The gun that Misaka 1 uses is a variant of a M1911 pistol that is often seen in the series. It is most likely a Colt variant, which uses a skeleton hammer and picatinny rail, like the Colt XSE.

Animation Trivia

 * At least 20 seconds from the previous episode are reused for the cold opening of the episode.
 * Scenes from episode 11 and 12 are reused for various flashbacks.

Unanswered Questions

 * What happened to the thugs Accelerator fought in the alleyway?
 * How was even the Sisters even capable of cleaning the alleyways efficiently in such a short amount of time?
 * What happened to Touma's suit case and the book he bought?