Today is the release of the 3rd volume for the A Certain Magical Index: Genesis Testament. Even being just released today. The book is now currently sitting on the top 2 Best Selling Light novels by Dengeki Bunko in Amazon Japan.
While the light novel is currently sitting on the Top 20 best selling book in all of Amazon Japan. As a light novel sitting on the Bestselling books in Japan. It is the only Light novel that is in the Top 20 right now!
You can buy your own physical copy of the A Certain Magical Index: Genesis Testament here at Amazon Japan and on Dengeki Bunko Website
A Certain Magical Index: Genesis Testaments is the third sequel to the Toaru Majutsu light novels.
Source: Amazon Japan