"C-Document" (C文書 C-Bunsho?) is the third episode of the third season of the Toaru Majutsu no Index anime series. It was broadcast on October 19th 2018, and was be directed by Nishikiori Hiroshi and written by Yoshino Hiroyuki.
- The Avignon Cleanup Operation is carried out by Academy City, causing major damage to Avignon in the process.
- Kamijou Touma and Itsuwa continue their battle with Terra of the Left. Touma eventually defeats Terra and destroys the Document of Constantine, but not before Terra catches onto the fact that Touma lost his memories.
- After escaping back to the Vatican, Terra is killed by Acqua of the Back, whom then decides to take action himself.
- Due to an interrupted phone call Touma made, Misaka Mikoto overhears part of his battle with Terra and learns about Touma's memory loss.
By order of appearance:
- Kamijou Touma
- Terra of the Left
- Tsuchimikado Motoharu
- Misaka Mikoto
- Lidvia Lorenzetti
- Stiyl Magnus
- Agnese Sanctis
- Biagio Busoni
- Acqua of the Back
- Matthai Reese
- Unnamed HsB-02 crewman
- Imagine Breaker - Kamijou Touma
- Execution of Light - Terra of the Left
- Accelerator (ability) - Accelerator
- Onmyoudou - Tsuchimikado Motoharu
- Academy City
- United Kingdom
- The voice actor of the unnamed HsB-02 crewman is Murakami Yūya.
- Touma's memory loss, incurred while saving Index and something he has kept secret since then, is brought up once more.
- The scene where Misaka tells Touma via phone that Academy City has intervened in Avignon is taken from a scene from the PV of the Toaru Majutsu no Index III anime shown Comiket 92. However, instead of daytime the scene in the episode proper is accurately shown to be nighttime due to the different timezones.
- The brief fantasy scene showing Index being the reason for Touma is taken from episode 4 of the first season of the Toaru Majutsu no Index anime.
- What is Imagine Breaker's true identity?
- What did Terra of the Left really know about Imagine Breaker?