OniAi
Ore no Imouto ga Konnani Kawaii Wake ga Nai Specials
Otoboku: Maidens are Falling for Me!
Ore ga Suki nano wa Imouto dakedo Imouto ja Nai Specials
Ore no Imouto ga Konnani Kawaii Wake ga Nai.: Ore no Imouto ga Konnani Eroge na Wake Nai
OniAi Specials
Ore, Tsushima (ONA)
ORESUKI Are you the only one who loves me? - Our Playball / Our End Run / Our Game
Oomuro-ke: Dear Friends
Onimai: I'm Now Your Sister!
Oreshura
Operation Han-Gyaku-Sei Million Arthur 2nd Season