A Reason to Protect (守る理由 Mamoru Riyū?) is the twentieth episode of the third season of the Toaru Majutsu no Index anime series. It was broadcast on February 22nd 2019, and was directed by Nogami Yoshiyuki, was storyboarded by Watanabe Takashi, and the script written by Kingetsu Ryunosuke.
- Touma faces Accelerator and defeats him, helping Accelerator to calm his craziness and leaves him a clue to save Last Order: Index Librorum Prohibitorum.
- Acqua comes to Russia to help Hamazura and the villagers.
- Misaka and Mugino are on their way to Russia.
- Fiamma prepares to start Project Bethlehem after capturing Sasha Kreutzev.
By order of appearance:
- Misaka Worst
- Kamijou Touma
- Vento of the Front
- Hamazura Shiage
- Takitsubo Rikou
- Knight Leader
- Kanzaki Kaori
- Agnese Sanctis
- Elizard (referenced)
- Last Order
- Index Librorum Prohibitorum (flashback)
- Acqua of the Back
- Shirai Kuroko
- Misaka Mikoto
- Mugino Shizuri
- Fiamma of the Right
- Sasha Kreutzev
- Elizalina Alliance of Independent Nations
- Strait of Dover
- Academy City
- The voice actress of the unnamed mother is Matsuda Risae.
- The voice actress of the unnamed daughter is Nukui Yuka.
- The voice actor of the unnamed driver is Yamane Masashi.
- The voice actor of the unnamed operator is Sugisaki Ryō.
Differences in AdaptationEdit
|#||Title||Time||Scene & Notes|
|Dog Fight||Accelerator vs. Touma|
|Deep Snow||Accelerator realizes what he should do|
|ROAR (Preview Version)||Preview|
- Accelerator: " You are the hero who saved all the Sisters! " - said to Touma after meeting him for the second time.
- Touma: "If you wanted to protect that kid, then do it with you head held high! Be pround now, you are able to keep her safe." - said to Accelerator.
- Accelerator: "I wanted to defend her, no matter what. So I rush headlong down the path I could choose - the path of evil - and got very good at being evil, but... the guy who never even considered whether he was good or evil turns out to be the strongest one. " - said to himself after Touma defeated him.
- Touma: "Sure, I'm a real lowlife. A no-account jerk who's been deceiving Index. But even if I am, it's not Fiamma that I should be bowing to." - said to himself.
- "Black wings cast a hue over the snowy plain. Blood-soaked fists clench tightly. The mightiest and the lowliest now once again clash."