Onihei
Origin: Spirits of the Past
Oretachi ni Tsubasa wa Nai: Hadairo Ritsu Kyuuwari Zou!?
Otoboku: Maidens are Falling for Me!
Otaku no Video
Orange
Overtake!
Over the Sky
Onmyoji
Only Yesterday
Otome wa Boku ni Koishiteru: Futari no Elder The Animation
One Week Friends