Is A Certain Magical Index Episode 21 Filler?
No — Episode 21 is Canon. This episode directly adapts content from the A Certain Magical Index manga and contains story-critical events. We strongly recommend watching all canon episodes to follow the main plot without missing key developments.
Episode Overview
The A Certain Magical Index Main arc of A Certain Magical Index continues with Episode 21: "Episode 21". Story developments in this episode are drawn directly from the A Certain Magical Index manga and carry forward the main plot. Episode 21 is story-critical. Watch it before continuing to the next episode.
Episode information is collated from multiple community sources and may contain inaccuracies.
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