| Name | Total | ... |
|---|---|---|
| One Time Gal | 0 | GO |
| Onee-chan ga Otouto no xxx | 2 | GO |
| Onee-chan Sensei | 4 | GO |
| Onee-chan! Tengoku | 2 | GO |
| Onee-san ni Katemasen | 2 | GO |
| Onee-san ni Osewa Sasete | 3 | GO |
| Onee-san to Game | 2 | GO |
| Onee-san Wa Tsuyoikara | 6 | GO |
| Onegai ♂ Counseling | 1 | GO |
| Onegai Eiki-sama | 2 | GO |
| Onegai! Darjeeling-sama | 1 | GO |
| Onegai! Fire Sisters★ | 5 | GO |
| ONE-HURRICANE | 5 | GO |
| One-Man Mercenary Army | 3 | GO |
| Onemuri Rune Sensei | 1 | GO |
| One-Night Magic | 3 | GO |
| Oneppyu | 2 | GO |
| One-shota (Tsukasawa Takamatsu) | 2 | GO |
| Oneshota Ero Manga | 3 | GO |
| Oneshota Friends | 2 | GO |
| Oneshota Ibun-roku | 1 | GO |
| OneShota Kyuunyuuki | 2 | GO |
| Oneshota Onsen | 2 | GO |
| Oni Chichi - Reborn | 2 | GO |
| Oni Chichi - Rebuild | 3 | GO |
| Oni Chichi - Refresh | 4 | GO |
| Oni Chichi 1 | 2 | GO |
| Oni Chichi 2 | 3 | GO |
| Oni Chichi 2 - Harvest | 1 | GO |
| Oni Chichi 2 - Revenge | 2 | GO |
| Oni no Sumu Ie | 3 | GO |
| Onigashima | 5 | GO |
| Onii-chan Asobo | Let's Play Onii-chan | 6 | GO |
| Onii-chan ga Genkinai kara SEX Shite Mita | 1 | GO |
| Onii-chan Ga, Suki. | 2 | GO |
| Onii-chan nan dakara | 2 | GO |