Oniichan wa Oshimai!

Onimusha

Ookami Shoujo to Kuro Ouji

Ookami Shoujo to Kuro Ouji: Gishinanki – Happening Kiss

Ookami to Koushinryou

Ookami to Koushinryou II

Ookami-san to Shichinin no Nakama-tachi

Ookiku Furikabutte

Ookiku Furikabutte: Natsu no Taikai-hen

Ooku The Inner Chambers

Ooyukiumi no Kaina

Orange

Ore Monogatari!!

Ore no Imouto ga Konnani Kawaii Wake ga Nai

Ore no Nounai Sentakushi ga, Gakuen Love Comedy wo Zenryoku de Jama Shiteiru

Ore wo Suki nano wa Omae dake ka yo

Orient

Orient: Awajishima Gekitou-hen

Osananajimi ga Zettai ni Makenai Love Comedy

Oshi no Ko

Osomatsu-san

Osomatsu-san Season 2

Osomatsu-san Season 3

Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta...

Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta... OVA

Otome Game no Hametsu Flag shika Nai Akuyaku Reijou ni Tensei shiteshimatta... X

Otome Game Sekai wa Mob ni Kibishii Sekai desu

Otome Youkai Zakuro

Otonari ni Ginga

Otonari no Tenshi-sama ni Itsunomanika Dame Ningen ni Sareteita Ken

Ou Dorobou Jing

Ouran Koukou Host Club

Ousama Ranking

Ousama Ranking: Yuuki no Takarabako

Oushitsu Kyoushi Heine

Outbreak Company