O/A
Manga
O/A is a Japanese manga by Keiji Watarai, serialized in Young Ace (Kadokawa Shoten) from vol. 5 of 2009 to the October 2012 issue. It was adapted into a radio drama and a novel in 2011.
Translated from the Japanese Wikipedia article, available under CC BY-SA 4.0. Translated and shortened by ManhWatch AI; may contain errors.