Onihei
Onii-chan Dakedo Ai Sae Areba Kankeinai yo ne!
Onimai: I'm Now Your Sister!
Onimusha
Onimusha (ITA)
Onipan!
Onmyo Kaiten Re:Birth Verse
Onmyoji
Onna no Sono no Hoshi
Onsen Yousei Hakone-chan
Onyx Equinox
Ookami Shoujo to Kuro Ouji
Ookami Shoujo to Kuro Ouji (ITA)
Ookami Shoujo to Kuro Ouji Recap
Ookami Shoujo to Kuro Ouji Recap (ITA)
Ookami Shoujo to Kuro Ouji: Gishinanki – Happening Kiss
Ookami-san to Shichinin no Nakama-tachi
Ookami-san wa Taberaretai
Ōoku: The Inner Chambers
Ōoku: The Inner Chambers (ITA)
Oomuro-ke: Dear Friends
Oomuro-ke: Dear Sisters
Opus.COLORs
Orange
Orange: Mirai
Orb: On the Movements of the Earth
Ore ga Ojousama Gakkou ni "Shomin Sample" Toshite Gets♥Sareta Ken
Ore ga Ojousama Gakkou ni "Shomin Sample" Toshite Gets♥Sareta Ken Specials
Ore ga Suki nano wa Imouto dakedo Imouto ja Nai
Ore ga Suki nano wa Imouto dakedo Imouto ja Nai Specials