Onimai: I'm Now Your Sister!
Osamake: Romcom Where The Childhood Friend Won't Lose
Overlord: Ple Ple Pleiades 3
One Punch Man: Road to Hero
ORESUKI Are you the only one who loves me?
Onipan!
Orphen 2: Revenge
Ore no Imouto ga Konnani Kawaii Wake ga Nai.
Oneechan ga Kita
OniAi
Outburst Dreamer Boys: It Is the Destiny of Those Born as Men
Osomatsu-san: Tamashii no Takoyaki Party to Densetsu no Otomarikai