Attack on Titan (OVA)

It is an OVA miniseries belonging to the anime series Attack on Titan.

Ilse's Notebook
Ilse's Notebook is the first trilogy of OVAs from the Attack on Titan anime, produced by Wit Studio and Production I.G, and included with a limited edition of Volume 12.

Additional voices

 * Erica Muse
 * Josh Putnam
 * Joshua Waters

No Regrets
No Regrets is the anime adaptation of the Attack on Titan: No Regrets manga that narrates Levi's past, included in volumes 15 and 16.

Additional voices

 * Jacob Eiseman
 * Kristian Eros
 * Phil Song

Lost Girls
Lost Girls is the second trilogy of Ovas, based on the Attack on Titan: Lost Girls manga that narrates the visual novel "Lost Girls", starring Annie Leonhart, included in volume 24.