| Name | Total | ... |
|---|---|---|
| orz | 6 | GO |
| OS tokku | 5 | GO |
| Osakana Planet | 1 | GO |
| Osaru no Noumiso | 5 | GO |
| OSHABAN | 1 | GO |
| Oshiruko Kan | 25 | GO |
| Osiris | 1 | GO |
| Osomatsusama | 2 | GO |
| OTA OFFICE | 5 | GO |
| Otabe Dynamites | 25 | GO |
| Otafuku-tei | 1 | GO |
| Otajai | 1 | GO |
| Otaku Beam | 28 | GO |
| OtakuLife Japan | 2 | GO |
| OTAUT-R | 1 | GO |
| Otentomaru | 6 | GO |
| Othello Ice | 18 | GO |
| OTO | 1 | GO |
| Otogi no Kuni no Soapland | 10 | GO |
| OTOGIYA X-9 | 2 | GO |
| Otokodama | 1 | GO |
| Otokojuku | 2 | GO |
| otokonoko de asobou | 1 | GO |
| Otome no Eden | 1 | GO |
| Otome Spider | 1 | GO |
| Otomekibun | 21 | GO |
| Otona Shuppan | 5 | GO |
| Otona Star | 4 | GO |
| Otonano Do-Wa | 3 | GO |
| Otonano Gu-wa | 18 | GO |
| Otonano Omochiya | 1 | GO |
| Otoreko | 1 | GO |
| Otukimi Koubo | 9 | GO |
| Oukoku Shineitai | 1 | GO |
| Oukokusan | 1 | GO |
| Ourakuen | 1 | GO |