| Title ▴▾ | | | | Released ▴▾ | Popularity ▴▾ | Rating ▴▾ |
| Ore-tachi ni Tsubasa wa Nai - Under the Innocent Sky. | | | | 2009-01-30 | 5.08 | 8.20 (320) |
| Okujou no Yurirei-san | | | | 2012-03-30 | 9.87 | 7.91 (956) |
| Otome Riron to Sono Shuuhen -Ecole de Paris- | | | | 2013-07-26 | 3.72 | 7.69 (231) |
| Oyako Rankan | | | | 2012-09-14 | 3.17 | 7.64 (235) |
| Omerta ~Chinmoku no Okite~ | | | | 2011-04-22 | 1.18 | 7.50 (115) |
| Onee-chan no Yuuwaku | | | | 2018-04-27 | 3.59 | 7.45 (281) |
| Ochiru Hitozuma | | | | 2011-12-23 | 6.38 | 7.45 (568) |
| Ourai no Gahkthun ~What a Shining Braves~ | | | | 2012-12-21 | 8.04 | 7.43 (659) |
| Otome ＊ Domain | | | | 2016-06-24 | 3.02 | 7.43 (232) |
| Ouchi ni Kaeru made ga Mashimaro Desu | | | | 2017-07-28 | 2.48 | 7.40 (168) |
| Otome ga Tsumugu Koi no Canvas | | | | 2012-03-30 | 3.09 | 7.36 (211) |
| Ouka Sabaki | | | | 2017-02-24 | 3.28 | 7.34 (249) |
| Ore-tachi ni Tsubasa wa Nai AfterStory | | | | 2010-07-30 | 1.70 | 7.32 (107) |
| Onii-chan, Asa made Zutto Gyutte Shite! | | | | 2018-05-25 | 2.00 | 7.25 (149) |
| Otome wa Boku ni Koishiteru ~Futari no Elder~ | | | | 2010-06-30 | 1.59 | 7.21 (97) |
| Our Life: Beginnings & Always | | | | 2020-11-16 | 0.50 | 7.20 (42) |
| Onii-chan, Kiss no Junbi wa Mada Desu ka? | | | | 2016-04-28 | 5.10 | 7.19 (482) |
| Onii-chan, Asa made Zutto Gyutte Shite! Yoru Made Motto Ecchi Shite! | | | | 2019-06-28 | 0.92 | 7.18 (51) |
| Omerta Code:Tycoon | | | | 2013-12-27 | 0.53 | 7.17 (48) |
| Onigokko! | | | | 2011-03-31 | 2.43 | 7.16 (181) |
| Otome Riron to Sono go no Shuuhen -Belle Époque- | | | | 2016-05-27 | 1.39 | 7.15 (85) |
| Ore no Sugata ga, Toumei ni!? Invisible to Suuki na Unmei | | | | 2020-03-27 | 1.26 | 7.11 (85) |
| Osananajimi wa Daitouryou: My Girlfriend is the President. | | | | 2009-10-30 | 25.74 | 7.11 (3065) |
| Otonari no Kokujin Otto ni Dakarete Nakimodaeru Saiai no Tsuma. Sono Hikikae ni Ajiwau Kokujin Tsuma no Hada. -Big Black Cock & Big Black Butt & My Sweet Wife- | | | | 2014-04-25 | 1.84 | 7.05 (120) |
| One Thousand Lies | | | | 2016-03-28 | 2.58 | 7.04 (281) |
| Ore-tachi ni Tsubasa wa Nai ~Prelude~ | | | | 2008-06-28 | 1.62 | 7.03 (110) |
| Ore to Saeko-san to Netorare Mail | | | | 2011-10-21 | 1.78 | 7.03 (104) |
| Oba Netori ~Otto no Shiranai Midara na Kankei~ | | | | 2016-04-01 | 1.19 | 7.03 (74) |
| Onigokko! Fandisc | | | | 2011-09-30 | 1.33 | 7.02 (89) |
| Oni Kantoku to Ore no Kanojo ~Joyuu no Tamago ga Oni Kantoku to Nikutai Kankei o Musunda Riyuu~ | | | | 2012-07-31 | 0.74 | 7.00 (41) |
| Ojou-sama wa Gokigen Naname | | | | 2013-05-24 | 1.71 | 6.99 (117) |
| Ochite Iku Niizuma ~Gomennasai Anata... Watashi Mou... demo, Aishiteru~ | | | | 2015-02-27 | 2.05 | 6.99 (124) |
| Ourai no Gahkthun: Shining Night | | | | 2013-08-23 | 0.60 | 6.99 (34) |
| Ore no Imouto ga Konna ni Kawaii Wake ga Nai | | | | 2011-01-27 | 3.14 | 6.98 (420) |
| Oh Yuusha yo, Itte Shimau to wa Nasakenai! | | | | 2015-08-28 | 1.24 | 6.97 (70) |
| Ore no Kanojo wa Taninbou ga Ki ni Naru You Desu. ~Karakai Jouzu na Hentai Kanojo to no Seishun Swapping wa, Ore no Kakure Seiheki o Kaikashi Hidaika Sasemashita~ | | | | 2020-07-31 | 0.96 | 6.97 (70) |
| Onee-san x Shuffle! ~Tomodachi no Onee-chan no Ecchi na Karada.~ | | | | 2017-12-22 | 1.16 | 6.96 (62) |
| Ore wa Tsuma Killer ~Tsuma 5nin, Musume 5nin, Oyakodon Okawari!~ | | | | 2011-11-18 | 1.50 | 6.96 (95) |
| Ore no Shita de Agake | | | | 2002-11-29 | 0.26 | 6.95 (23) |
| Omoi o Sasageru Otome no Melody | | | | 2017-03-24 | 1.19 | 6.95 (80) |
| Owaru Sekai to Birthday | | | | 2012-07-27 | 1.47 | 6.95 (98) |
| Onee-san Sensei ~Hoshuu Jugyou no Ecchi na Sensei~ | | | | 2019-03-29 | 0.94 | 6.95 (58) |
| Onii-chan, Kiss no Junbi wa Mada Desu ka? Ecchi no Junbi mo Mada Desu ka? | | | | 2017-02-24 | 1.10 | 6.94 (66) |
| Ouzoku | | | | 2007-06-29 | 0.95 | 6.94 (56) |
| Ouka Sengoku! ~Nobunaga-chan no Koishite Yabou!?~ | | | | 2010-10-29 | 0.79 | 6.94 (43) |
| Omae no Kaa-chan, Ii Onna Da yo na. | | | | 2018-09-21 | 1.66 | 6.93 (118) |
| Onii-chan ni wa Zettai Ienai Taisetsu na Koto. | | | | 2013-01-11 | 1.16 | 6.93 (64) |
| Onii-chan Sharing | | | | 2013-09-27 | 1.59 | 6.92 (112) |
| Ore to 5-nin no Yome-san ga Raburabu nano wa, Mirai kara Kita Aka-chan no Okage ni Chigainai!? | | | | 2012-12-21 | 1.40 | 6.92 (89) |
| Otome wa Boku ni Koishiteru | | | | 2005-01-28 | 8.07 | 6.91 (747) |
