archytele The Vault
Season guide

A Certain Scientific Railgun: A Certain Scientific Railgun S

24 episodes Premiered Apr 12, 2013 Updated Oct 25, 2026

Topic: "A Certain Scientific Railgun" Season 2. Constraint 1: Use ONLY provided SYNOPSIS and SOURCES. Constraint 2: Write ONLY verifiable facts. Constraint 3: No inventing/guessing titles, names, dates, etc. Constraint 4: Output format: Valid JSON only. Constraint 5: JSON keys: overview (160-220 words), primer (array of exactly 4 concise bullet points). Constraint 6: Prose style: Original, neutral, encyclopedic, plai

Previously on A Certain Scientific Railgun

Season 2 Lore Primer

Key plot threads, lore context, and character stakes you need to remember before diving into this season.

  • ⚡ Something sinister is going on in Academy City.
  • ⚡ Character alliances, factions, and personal loyalties undergo significant shifts under escalating stakes.
  • ⚡ Addresses unresolved cliffhangers and thematic mysteries introduced during previous seasons.
  • ⚡ Establishes the primary seasonal conflict that drives serialized character arcs toward the finale.
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Season overview

Topic: "A Certain Scientific Railgun" Season 2.
Constraint 1: Use ONLY provided SYNOPSIS and SOURCES.
Constraint 2: Write ONLY verifiable facts.
Constraint 3: No inventing/guessing titles, names, dates, etc.
Constraint 4: Output format: Valid JSON only.
Constraint 5: JSON keys: overview (160-220 words), primer (array of exactly 4 concise bullet points).
Constraint 6: Prose style: Original, neutral, encyclopedic, plain text (no markdown/asterisks/headings/bullets in the prose).
Synopsis: Sinister things in Academy City. Organization cloning super-powered students (espers). Mikoto Misaka (high-ranking master of electricity) encounters a copy of herself. Clones (her sisters) are being murdered in experiments to turn a sadistic killer into the strongest esper. Misaka vows to save them and destroy the organization. Misaka discovers she wasn't the only victim of scientific forces. Misaka and the girls of Judgement will fight this.
Source 1: General info (no new plot).
Source 2: Cast/crew info (no new plot).
Source 3: Redirect (no new plot).
Source 4: Misaka has electro-manipulation skills and a railgun projectile movement. Academy City is a techno-metropolis filled with supernaturally powerful students called Espers. Misaka's friend and roommate is Shirai Kuroko, who uses teleportation.
Source 5: Mentions Daihasei Festival (seven-day sports competition between Esper schools, including Tokiwadai middle school).
Overview Construction:
Academy City is a techno-metropolis inhabited by supernaturally powerful students known as Espers. Among these students is Mikoto Misaka, a high-ranking master of electricity characterized by her electro-manipulation skills and destructive railgun projectile movement. A sinister plot emerges within the city involving an organization that is cloning Espers. Mikoto Misaka encounters a clone of herself and discovers that these clones, referred to as her sisters, are being systematically murdered during experiments. These experiments are designed to transform a sadistic killer into the strongest esper in history. In response to these findings, Misaka vows to save her copies and destroy the organization responsible for the project. As she prepares to confront the power-hungry esper behind the organization, she learns that she was not the only victim of the scientific forces operating within the city. Alongside the girls of Judgement, Misaka prepares to stand against these conspiracies. The narrative follows her struggle against the scientific forces conspiring within Academy

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Season 2 Episodes

Episode Guide

🛡️ SPOILER SHIELD

Season 2 Progress Shield

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Binge Efficiency Engine

Season 2: Filler vs. Essential Canon

Filter episodes by narrative weight. Focus on essential mytharc and skip standalone side quests.

13%
88%
Mytharc (3): Crucial lore & season climaxes
Core (21): Character development & subplots
Side Quest (0): Standalone / filler
S2·E1 Mytharc

Railgun

Apr 12, 2013 · 23 min

Haru'ue joins Saten and Uiharu on a trip to the Garden of Learning to see Misaka and Shirai, as well as to do some shopping. They later go to visit Edasaki in the hospital, where s

S2·E2 Core

Critical

Apr 19, 2013 · 23 min

After dreaming of her past, Misaka sets out for a day of shopping, but when Kuroko suggests a shortcut, they find an envelope with a cash card in it--one of many placed throughout

S2·E3 Core

Project Radio Noise

Apr 26, 2013 · 23 min

Rumors swirl about that Misaka is the template for a project to produce Level 5 clones. When Nunotaba refers to her as the "Original," Misaka decides to check her out, and learns t

S2·E4 Core

Sisters

May 3, 2013 · 23 min

In high spirits, Misaka joins the other girls for a day of shopping at Seventh Mist, where she helps the others with their shopping, as well. Misaka spends another day playing with

S2·E5 Core

Project Level 6 Shift

May 10, 2013 · 23 min

Finding herself face-to-face with a clone of herself, Misaka ends up helping her get a cat out of a tree, sharing ice cream cones, and having tea with her. It isn't until later tha

S2·E6 Core

I... Can See All of You

May 17, 2013 · 23 min

Misaka lashes out at Accelerator, but is left frustrated. She realizes the full breadth of the situation she has become involved in, and feels responsible for allowing it to happen

S2·E7 Core

I... I Want to Be of Help To You, Sissy

May 24, 2013 · 23 min

Misaka manages to sabotage most of the experimental facilities remotely before she is cut off, leaving her to deal with the rest in person. Shirai resolves to help Misaka by doing

S2·E8 Core

ITEM

May 31, 2013 · 23 min

The members of the underworld organization ITEM finish one mission, and are called in to defend the remaining facilities. When Misaka tries to infiltrate one building, she encounte

S2·E9 Core

AIM Stalker

Jun 7, 2013 · 23 min

As Misaka continues her way into the research facility, she and Mugino play a game of cat-and-mouse. Meanwhile, at the other facility, Nunotaba sneaks into a control room, planning

S2·E10 Core

Meltdowner

Jun 14, 2013 · 23 min

Having realized who Misaka is, Mugino decides to give her a run for her third-place ranking. When Frenda mistakenly leaves her doll-bombs behind while heading to the other facility

S2·E11 Core

The Vending Machine

Jun 21, 2013 · 23 min

Misaka and Kamijo meet again at the malfunctioning vending machine in the park, where Shirai mistakes him for being Misaka's boyfriend. Misaka becomes shaken when she bumps into an

S2·E12 Core

Tree Diagram

Jun 28, 2013 · 23 min

Misaka sets out on one last mission to put a halt to the experiments by destroying the supercomputer Tree Diagram. Meanwhile, Kamijo runs into Misaka's clone #10032 again, and the

S2·E13 Core

Accelerator

Jul 5, 2013 · 23 min

Thwarted in her attempt to sabotage Tree Diagram, Misaka takes her frustration out on a nearby lab that is part of the project. Meanwhile, Accelerator and #10031 carry out their ex

S2·E14 Core

The Promise

Jul 12, 2013 · 23 min

While Shirai frets about Misaka staying out again all night, she receives a visit from Kamijo, who manages to find Misaka's documents about the project. Kamijo catches up with Misa

S2·E15 Core

Kamijo Toma

Jul 19, 2013 · 23 min

Kamijo races to the scene of the experiment, only to find that it has already started. Kamijo calls out Accelerator, who takes him to be yet another challenger to his position, unt

S2·E16 Core

Sisterhood

Jul 26, 2013 · 23 min

Misaka stands up for clone #10032, declaring that she is doing so because they are sisters. The next day, the two of them spend time in a park, where 10032 asks her for a special f

S2·E17 Core

Study Group

Aug 2, 2013 · 23 min

With the end of summer vacation approaching, the girls plan a study session at Saten's apartment to catch up on homework. Everyone is to bring an ingredient for a potluck stew part

S2·E18 Core

Moving

Aug 16, 2013 · 23 min

Edasaki is due to be discharged from the hospital, and it is learned that she will be living with Haru'ue. The move is bittersweet for Uiharu, who is losing her roommate, but she f

S2·E19 Core

Academic Reach Assembly

Aug 23, 2013 · 23 min

Febri takes an instant liking to Saten, and is warm to everyone except for Misaka, much to her chagrin. At Judgment, Uiharu is unable to find any information on who Febri is, so ar

S2·E20 Core

Febri

Aug 23, 2013 · 23 min

As Yomikawa takes over investigating the runaway security robots, Konori invites the whole gang out to take in a bath at a bathhouse. On their way home, a number of detours lead th

S2·E21 Core

Darkness

Aug 30, 2013 · 23 min

With the revelation that Febri is synthetic, Misaka is determined to find whoever built her, and have them fix her. The investigation is stalled on all fronts, even with the help o

S2·E22 Core

STUDY

Sep 6, 2013 · 23 min

Therestina reluctantly provides Misaka with the clues she needs to find the group behind Febrie's secret. With Kongo's help, the girls identify Aritomi as the man they are pursuing

S2·E23 Mytharc

Silent Party

Sep 13, 2013 · 23 min

Aritomi reveals his motivations for STUDY's project to Misaka. She also learns about Nunotaba's plight, and some of the details concerning what STUDY has planned at the Reach Assem

S2·E24 Mytharc

Eternal Party

Sep 20, 2013 · 23 min

Shirai, Konori, Kongo and friends, and Uiharu and Saten confront the powered suits at the four Assembly sites, where they soon receive backup. Misaka and Febrie move to take on Ari

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