One: Kagayaku Kisetsu e
One Week Friends
Only Yesterday
Orange
Orb: On the Movements of the Earth
Over the Sky
Otaku no Video
Otoboku: Maidens are Falling for Me!
Otaku Elf
Oretachi ni Tsubasa wa Nai: Hadairo Ritsu Kyuuwari Zou!?
Origin: Spirits of the Past
Owarimonogatari 2nd Season Recaps