Onipan!
Otoboku: Maidens are Falling for Me! Special
ORESUKI Are you the only one who loves me?
Overlord: Ple Ple Pleiades 3
One: Kagayaku Kisetsu e
Ore, Tsushima
Oomuro-ke: Dear Sisters
Osomatsu-san: Tamashii no Takoyaki Party to Densetsu no Otomarikai
Ore no Imouto ga Konnani Kawaii Wake ga Nai
Osomatsu-san: Hipipo-Zoku to Kagayaku Kajitsu
Outburst Dreamer Boys: It Is the Destiny of Those Born as Men
Ore no Imouto ga Konnani Kawaii Wake ga Nai.: Ore no Imouto ga Konnani Eroge na Wake Nai