| Score ▴▾ | Title ▴▾ | | | Released ▴▾ | Rating ▴▾ (▴▾) |
| Offline de Ecchi na Level Age | | | 2021-12-30 | 5.67 (8) |
| Off Pako Saretara, Ecchi na Assistant ga Dekichatta? ~Boku ga Urekko ni Natta Riyuu~ | | | 2016-05-06 | 6.40 (20) |
| Ojou-sama wa Hime Kishi | | | 2009-03-27 | - (2) |
| Oku-sama wa ****gakusei | | | 2006-08-13 | 7.15 (14) |
| ONE. | | | 2023-12-21 | 7.01 (183) |
| Onee-chan Saimin Before After | | | 2013-09-06 | 6.06 (46) |
| One Love ~Yoru no Boku wa Ecchi na Onee-chan no Omocha ni Naru~ | | | 2017-08-31 | 6.80 (21) |
| One → Shota ← One | | | 2020-11-27 | 7.57 (80) |
| Onii-chan, Asa made Zutto Gyutte Shite! | | | 2018-05-25 | 7.48 (279) |
| Onii-chan Daisuki! ~Love? Or Like?~ | | | 2007-08-17 | 6.56 (18) |
| Onii-chan Nechatta? | | | 2016-08-12 | 5.95 (21) |
| Ore no Kanojo no Uraomote | | | 2012-04-27 | 7.01 (114) |
| Ore no Natsuyasumi 2 | | | 2003-08-17 | 6.05 (16) |
| Ore no Sugata ga, Toumei ni!? Invisible to Suuki na Unmei | | | 2020-03-27 | 7.52 (223) |
| Ore-tachi ga Shinda Natsu, Tenshi no Ita Mikkakan. | | | 2011-08-13 | 6.85 (6) |
| Ore-tachi ni Tsubasa wa Nai ―――under the innocent sky. | | | 2009-01-30 | 8.57 (468) |
| Ore to Vita to One Room | | | 2012-08-12 | 5.24 (5) |
| Osanasugiru Katei Kyoushi | | | 2016-09-30 | 5.74 (21) |
| Oshikake Kanojo wa, Ore no Sewa o Shitai | | | 2019-11-29 | 7.50 (34) |
| Oshino Ruka wa Iyashite Agetai | | | 2023-02-24 | 7.29 (30) |
| Otokano ~Otouto no Kanojo ga Bunkei de Tsuyome!?~ | | | 2022-05-27 | 7.65 (75) |
| Otokoyu de Deatta Shoujo Akane | | | 2013-08-18 | 5.68 (19) |
| Otome * Domain | | | 2016-06-24 | 7.48 (904) |
| Otome Juurin Yuugi ~Maiden Infringement Play~ | | | 2006-12-22 | 7.03 (15) |
| Otoshigoro Gakuen | | | 2022-01-27 | 7.05 (9) |
| Oyatsu no Jikan | | | 2004-12-24 | 6.48 (13) |
| Panical Confusion | | | 2015-03-27 | 7.46 (68) |
| ~Pantsu o Miseru Koto, Sore ga...~ Daiuchuu no Hokori | | | 2009-06-25 | 6.97 (58) |
| Papa, Dakishimete Ageru ~Babumi na Manamusume no Bosei ni Amaete Nakadashi Zanmai~ | | | 2018-03-09 | 6.19 (28) |
| Papa to Musume no Seikyouiku * Jissen Komi | | | 2016-02-25 | 6.70 (15) |
| Papikon ~Futago no Musume wa Doukyuusei?!~ | | | 2005-06-24 | 6.92 (13) |
| Parallel Akiba Gakuen | | | 2021-05-28 | 7.34 (20) |
| Princess Heart Link ~Kenki-tachi no Enbu~ | | | 2020-08-28 | 7.96 (126) |
| Princess Lover! | | | 2008-06-27 | 7.37 (404) |
| RE:D Cherish! | | | 2022-02-25 | 7.76 (147) |
| Riajuu Plus ver. Komatsuzaki Kaname | | | 2013-01-01 | 5.35 (215) |
| Rina no Chiisana Oka | | | 2017-07-14 | 5.95 (68) |
| ♥ri no Hentai Nikki ~Chijo ni Naritai Onna no Ko~ | | | 2013-08-09 | 6.25 (43) |
| Roshutsu Kanojo. | | | 2011-08-12 | 6.27 (28) |
| Ryobaku ~Haitoku no Atelier~ | | | 2011-05-20 | - (1) |
| Ryuukishi Bloody † Saga | | | 2016-12-22 | 7.07 (83) |
| Saimin Seikatsu ~Kousoku Dakara Shikatanai!?~ | | | 2010-02-26 | 6.42 (54) |
| Sakura Iro, Mau Koro ni | | | 2019-03-29 | 7.11 (61) |
| Sakura, Moyu. -as the Night's, Reincarnation- | | | 2019-01-31 | 8.60 (506) |
| Sakura no Kumo * Scarlet no Koi | | | 2020-09-25 | 8.10 (292) |
| Sanoba Witch | | | 2015-02-27 | 7.84 (4381) |
| Sawasawa Enikki ~Imouto to Chomechome Hen~ | | | 2006-03-16 | 5.46 (5) |
| School Captain: Kaichou Kouho wa Gorippuku | | | 2009-08-16 | 6.53 (17) |
| Seidorei “Misato” ~Joshi ○gakusei Kankin Rape~ | | | 2020-01-25 | 5.69 (13) |
| Seisenki Valkyrie Sisters ~Yami ni Ochita Idol~ | | | 2011-02-25 | 6.62 (24) |