Shounen

Oda Nobunaga to Iu Nazo no Shokugyo ga Mahou Kenshi yori Cheat Dattanode, Oukoku wo Tsukuru Koto ni Shimashita

Ogami Tsumiki to Kinichijou.

Ojousama no Shimobe

Okaeri Alice

Okitegami Kyouko no Bibouroku

Old Rookie

One Piece

One Step to the Devil

Onigoroshi no Gadou Saien

Only Sense Online