One: Kagayaku Kisetsu e
Oretachi ni Tsubasa wa Nai: Hadairo Ritsu Kyuuwari Zou!?
Onihei
Otaku no Video
Orange
Owarimonogatari
Otome wa Boku ni Koishiteru: Futari no Elder The Animation
Origin: Spirits of the Past
Orange: Mirai
Otaku Elf
Overtake!
Only Yesterday