Toaru Majutsu no Index Light Novel Volume 21 was first published on August 10, 2010. It is the second novel that depicts the events of World War III for the finale of the series. It features the continuing efforts of the three protagonists with their own individual struggles.

Publisher's Summary

October 30th. Eleven days have passed since the outbreak of World War III. Three boys, with their secret thoughts, had ran into flames in Russia.

To cure the former ITEM member Takitsubou Rikou, Hamazura Shiage is searching for a treatment. The key is his encounter with the God's Right Seat member, the Saint Acqua of the Back.

The "strongest" esper, Accelerator, after a battle with the weakest rival, is being transferred to the Elizarina Independent Alliance. Accelerator still hasn't found any leads to saving Last Order. The key is the magic that contains a mysterious parchment.

Kamijou Touma, to finally encounter Fiamma, used discretion to escape. The event where Index returns to full health has not come true. The key to that is the resident of another dimension who calls itself an "Angel".

Three different hidden feelings, when science and the magic cross, the story starts—!


  • Prologue: War Report
  • Chapter 5: The Battlefield Called the Complicated Tray — Enter_Project.
  • Chapter 6: The Unfolding of the True Darkness — Up_the_Castle.
  • Chapter 7: Up the Sky is the Slaughtering Angel — MISHA_the_Angel_"GABRIEL".
  • Chapter 8: Their Many-sided Counterattack — Combination.
  • Epilogue: War Report


Localized Releases


A Certain Magical Index Volume 21
A Certain Magical Index Light Novel v21 cover
Release Date English December 17, 2019[2]
ISBN-13 English ISBN 978-1-975-33126-9[2]
Number of Pages 288 pages
As war continues to threaten to change the entire planet as they know it, three young boys are each desperately searching for the answers to their troubles in Russia. Hamazura is still looking for any clues to how he might be able to cure his friend's condition. Accelerator can't stop until he finds a way to save one helpless girl. And Kamijou won't give up on returning Index back to normal, no matter who stands in his way!


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