Oomuro-ke: Dear Sisters
Outbreak Company
Oreshura
Ore no Imouto ga Konnani Kawaii Wake ga Nai.: Ore no Imouto ga Konnani Eroge na Wake Nai
Otaku no Video
Overlord: Ple Ple Pleiades - Nazarick Saidai no Kiki
ORESUKI Are you the only one who loves me? - I Politely Move Things Forward
Ouran High School Host Club
Ore no Imouto ga Konnani Kawaii Wake ga Nai.
Oneechan ga Kita: Hajimete no… Kitaa!
Osomatsu-san: Hipipo-Zoku to Kagayaku Kajitsu
Outburst Dreamer Boys