A Certain Scientific Railgun — Story Arcs & Filler Guide
Episode ranges, plot summaries, and frequently asked questions for every major arc in A Certain Scientific Railgun. Updated 2026.
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Season 1
Eps 1–24 · 24 epsHow does A Certain Scientific Railgun begin?
Episodes 1-24 (2009-2010) follow Mikoto Misaka, the third-ranked Level 5 esper in Academy City known as the Railgun, alongside her friends Kuroko Shirai, Kazari Uiharu, and Ruiko Saten, as they investigate a series of incidents involving illegally created Level Upper devices and their own entanglement with the city's darker esper-science experiments.
Season 2 (S)
Eps 25–48 · 24 epsWhat does Railgun S cover?
Episodes 25-48 (2013) adapt the Sisters Arc, one of the franchise's most acclaimed storylines, revealing the horrifying truth behind Academy City's cloning experiments on thousands of Misaka clones, forcing Mikoto into a direct confrontation with the scientist responsible.
Season 3 (T)
Eps 49–73 · 25 epsWhat happens in Railgun T?
Episodes 49-73 (2020) adapt the Daihasei Festival Arc, following Mikoto and her friends through Academy City's major athletic festival while a new conspiracy involving powerful, unregistered espers threatens to disrupt it.