- Occultic;Nine-オカルティック・ナイン-
- ONE PIECE
- Only Sense Online 白銀の女神
- Only Sense Online
- Only with Your Heart
- ONE PIECE novel A
- OFF AIR
- ONE PIECE novel LAW
- ONE PIECE novel HEROINES
- ONE PIECE FILM RED
- ONE PIECE novel HEROINES [Colorful]
- OL辞めて、ミル・タンドレスでシェフを始めました
- Oh! My Goddess
- Overlord
- Occult Academy
- Orphen
- Orphen, el bruixot
- Ore ga Ojō-sama Gakkō ni "Shomin Sample" Toshite Rachirareta Ken
- Ore no Nōnai Sentakushi ga, Gakuen Love Come o Zenryoku de Jama Shiteiru
- Ore no Nōnai Sentakushi ga, Gakuen Rabu Kome o Zenryoku de Jama Shiteiru
- Ore no Imōto ga Konna ni Kawaii Wake ga Nai
- Oreimo
- Onii-chan dakedo Ai sae Areba Kankeinai yo ne!
- OniAi
- Ore no Kanojo to Osananajimi ga Shuraba Sugiru
- OreShura
- Oda Nobuna no yabō
- Ore, Twintail ni Narimasu.
- Outbreak Company: Moeru Shinryakusha
- Outbreak Company
- Occultic;Nine -오컬틱 나인-
- Occultic;Nine
- Okko y los fantasmas
- Occhi di gatto
- Orange Road
- One Piece
- Owari no Seraph
- Ore ga Suki nano wa Imōto dakedo Imōto ja nai
- Ore o Suki nano wa Omae dake kayo
- Ore wo Suki Nano wa Omae Dake ka yo
- Okashi na Tensei
- Owarimonogatari
- Our Last Crusade or the Rise of a New World
- Otome Game no Hametsu Flag Shika Nai Akuyaku Reijō ni Tensei Shiteshimatta…
- Ore dake Haireru Kakushi Dungeon: Kossori Kitaete Sekai Saikyou
- Ousama Game – Spiel oder stirb!
- Overkill – Durch die Hölle zur Ewigkeit
- Otome Game Sekai wa Mob ni Kibishii Sekai desu
- Otomegē Sekai wa Mobu ni Kibishii Sekai Desu
- OsaMake
- Osananajimi ga Zettai ni Makenai Love Comedy
- Otonari no Tenshi-sama ni Itsu no Ma ni ka Dame Ningen ni Sareteita Ken
- One Piece: Stampede
- One Piece: Estampida
- Onward: Keine halben Sachen
- Onward
- Otherside Picnic
- One Piece Film: Red