Oneechan ga Kita: Hajimete no… Kitaa!
Our Dating Story: The Experienced You and The Inexperienced Me
Operation Han-Gyaku-Sei Million Arthur
Outburst Dreamer Boys: It Is the Destiny of Those Born as Men
Otaku Elf
Operation Han-Gyaku-Sei Million Arthur 2nd Season
Otome wa Boku ni Koishiteru: Futari no Elder The Animation
Osomatsu-san: Ouma de Kobanashi
Only Yesterday
Oretachi ni Tsubasa wa Nai: Hadairo Ritsu Kyuuwari Zou!?
Onigiri
Orphen