A Certain Scientific Railgun S

とある科学の超電磁砲S (Toaru Kagaku no Railgun S)

8.0(217,924)

MAL Score

Ranked #762

Popularity #661

Action
Fantasy
Sci-Fi
Super Power
Urban Fantasy

Episodes: 24
Duration: 24 min per ep
Aired: Apr 12, 2013 to Sep 27, 2013
Status: Finished Airing

Synopsis

Mikoto Misaka returns to the ever-restless Academy City alongside her friends, following a string of unsettling rumors. What begins as routine investigation turns grim when Mikoto uncovers a clandestine project built on brutal experimentation—one that has already claimed the lives of thousands of espers. The victims aren’t strangers, either: they’re clones created from Mikoto herself.

Haunted by the idea that her own powers and identity are tied to the atrocities, Mikoto takes it upon herself to stop the operation. But the deeper she pushes into Academy City’s hidden machinery, the more formidable the opposition becomes, drawing her into a fight against espers whose strength rivals the city’s most dangerous secrets.

Otaku Consensus

A Certain Scientific Railgun S is widely treated as the point where Railgun stops being merely the more personable Index spinoff and becomes one of Academy City’s strongest adaptations, driven by Tatsuyuki Nagai’s focused direction, J.C.Staff’s sharper action staging, and the acclaimed Sisters arc. Fans and critics praise its pacing and character-centered emotional payoff, while the most persistent criticism is that the anime-original back stretch lacks the same narrative weight as the manga-derived material.

Why You Should Watch

Watch Railgun S if you want super-powered urban fantasy with the density of the Toaru universe but less of Index’s lore sprawl and more time spent on how a small cast processes the city around them. It scratches the same itch as superhero-school anime, but its best material is built around surveillance, institutional secrecy, and the ethics of engineered power rather than tournaments or destiny speeches. The appeal is the contrast: café banter and school-life rhythms sit directly beside clinical sci-fi horror, and the tonal collision makes the action land harder. Viewers who prefer female-led ensembles, readable ability battles, and arcs that let consequences accumulate episode by episode will find this season the franchise’s cleanest on-ramp and one of J.C.Staff’s more memorable 2010s genre showcases.

Key Characters

M
Mikoto Misaka(VA: Rina Satou)
Mikoto is the rare action heroine whose confidence, temper, and guilt are all treated as active forces in the story rather than as quirks around the combat scenes.
R
Ruiko Saten(VA: Kanae Itou)
Saten gives the series its most grounded civilian texture, often making Academy City feel lived-in instead of merely engineered for battles.
K
Kuroko Shirai(VA: Satomi Arai)
Kuroko’s mix of teleportation-police efficiency, comic intensity, and unabashed fixation on Mikoto makes her one of the franchise’s most instantly recognizable supporting leads.
K
Kazari Uiharu(VA: Aki Toyosaki)
Uiharu balances the team with information-work competence and a softer presence that keeps the show’s friendship dynamic from becoming pure banter.

What Makes It Stand Out

1
The season’s central manga-derived Sisters arc is the material most often cited when fans call Railgun superior to Index, because it reframes Academy City through Mikoto’s personal stake rather than through franchise exposition.
2
Railgun S uses a deliberate two-part structure: a manga-based arc followed by an anime-original arc, a split that many viewers praise for variety but also identify as the source of the season’s unevenness.
3
J.C.Staff’s production is anchored by director Tatsuyuki Nagai and action director Yousuke Kabashima, giving the power battles a cleaner sense of impact and geography than the franchise’s more exposition-heavy entries.
4
The cast profile is unusually specific for a mainstream action sci-fi series: AniList tags it as Female Protagonist at 88%, Primarily Female Cast at 76%, and Primarily Teen Cast at 73%, matching the show’s emphasis on peer relationships inside Academy City.
5
The show’s genre mix is not just Action and Sci-Fi; its strongest identity is Super Power urban fantasy, with AniList tagging Super Power at 97% and Urban Fantasy at 91%.

Fun Facts & Trivia

Fun fact 1: Railgun S aired as a 24-episode TV season from April 12 to September 27, 2013, placing it in the early-2010s period when J.C.Staff was heavily associated with light-novel and manga franchise adaptations.
Fun fact 2: The production credits preserve the Toaru franchise’s layered source lineage: Kazuma Kamachi is credited for the original story, while Motoi Fuyukawa and Kiyotaka Haimura are both credited for original character design.
Fun fact 3: Series composition was handled by Seishi Minakami, with Yuuichi Tanaka on character design and Yukie Hiyamizu on sub-character design, indicating a production that separated lead cast polish from the broader Academy City supporting population.
Fun fact 4: Watch-order debate is part of the show’s reception history: one user review specifically warns against starting Railgun before Index even while acknowledging the common fan claim that Railgun is the stronger branch of the franchise.
Fun fact 5: Its cross-platform numbers reflect durable approval rather than niche cult status: it holds an 8/10 MAL score from 217,764 votes, a #658 MAL popularity rank, a 79/100 AniList score, and 2,251 AniList favourites.