O

Over Drive

Occult Academy

Oda Nobuna no Yabou

Okane ga Nai

Okusama wa Joshikousei

Okusama wa Mahou Shoujo

Omamori Himari

Onegai Teacher

Onegai Twins

One Outs

One Piece

Onii-chan Dakedo Ai Sae Areba Kankeinai yo ne

Oniichan no Koto nanka Zenzen Suki Janain Dakara ne

Onmyou Taisenki

Ookami Kakushi

Ookami san to Shichinin no Nakamatachi

Ookiku Furikabutte

Ore no Imouto ga Konna ni Kawaii Wake ga Nai

Ore no Imouto ga Konna ni Kawaii Wake ga Nai 2

Onii-chan Dakedo Ai Sae Areba Kankeinai yo ne

Ore no Kanojo to Osananajimi ga Shuraba

Ore no Nounai Sentakushi ga Gakuen

Oretachi ni Tsubasa wa Nai

Oruchuban Ebichu

Otogizoushi

Otome wa Boku ni Koishiteru

Otome Youkai Zakuro

Ouran High School Host Club

Outbreak Company

OutLaw Star

Ozuma