Rigorous Suspect
Hidan no Aria Volume 21 Cover
Volume Title Rigorous Suspect
Release Date August 25, 2015
ISBN-13 978-4-04-067750-7
Number of Pages 250
Cover Character/s Riko Mine
Volume Navigation
Volume 20
Volume 22

Rigorous Suspect is the twenty-first volume of the Hidan no Aria novel series released on August 25, 2015. This novel concludes the Scarlet Ammo arc and Scarlet Ammo storyline that began in Volume 8. The novel also acts as a transition to the next phase of the story.

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Hidan no Aria Series
Hidan no Aria AA
AA Novel

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