| Osanai Imouto no Sei Nikki ~Anna to Ichigo~ | 2005-06-12 | - |
| Osanai Imouto no Sei Nikki ~Natsumi to Haruna~ | 2004-11 | - |
| Osanai Lemon to Otona no Vanilla | 2026-04-27 | - (3) |
| Osananajimi | 1997-12-29 | - (2) |
| Osananajimi | 2002-10-04 | - (4) |
| Osananajimi | 2000-10-13 | - (1) |
| Osananajimi 2 | 1999-12-26 | - (2) |
| Osananajimi Childhood Love | 2024-05-27 | 6.00 (12) |
| Osananajimi DAYS ~Anna to kurasu 14-nich~ | 2023-10-14 | 6.40 (13) |
| Osananajimi Ojou-sama to H de Himitsu na Dousei Seikatsu | 2023-07-28 | 6.40 (29) |
| Osananajimi Yori mo Eroi Mobko to no Houkago Ecchi ~Boku wa Class no Jimiko ni Koi o Shita~ | 2023-02-03 | 6.30 (17) |
| Osananajimi ga Chichioya to Dekiteita Ken ni Tsuite ~Oyaji kara no Shuuchi Netori Choukyou~ | 2016-04-01 | 6.50 (32) |
| Osananajimi ga Dosukebe Kawaii | 2018-08-25 | - (4) |
| Osananajimi ga Ore o Okazu ni Jii Shimakutteita Ken ~Jibaku Shumi no Do Hentai Deshita~ | 2022-12-02 | 5.90 (6) |
| Osananajimi na Kanojo | 2005-03-25 | - (3) |
| Osananajimi na Miko-san to ~Saiji ni Koi ni... Shokushu!? Made~ | 2004-10-22 | - (2) |
| Osananajimi no Iru Kurashi | 2021-04-30 | 7.00 (64) |
| Osananajimi no Kane de Taberu Yakiniku wa Umai?! | 2017-05-21 | - (2) |
| Osananajimi no Kanojo to Namaiki na Imouto o Bitch ni Shiteyatta Fuhaha (Game Version) | 2013-01-25 | - |
| Osananajimi no Kokoro ga Yometara Dou Suru ka? | 2014-08-17 | 6.10 (9) |
| Osananajimi no Nukumori | 2005-03-25 | - (3) |
| Osananajimi no Onee-chan Sensei to H de Naisho na Kankei!? | 2019-09-01 | 7.10 (51) |
| Osananajimi no Otoko no Ko ga Mesugaki Datta Ken | 2022-12-23 | 6.50 (7) |
| Osananajimi no Yaoya no Musume ga, Eros na Taikai ni Shutsujou Shimasu. | 2017-08-13 | 5.60 (13) |
| Osananajimi o Ushinatta Natsu... | 2016-08-26 | 6.60 (37) |
| Osananajimi to Ama~ku Ecchi ni Sugosu Houhou | 2007-02-23 | 7.20 (28) |
| Osananajimi to Juu Nen, Natsu | 2012-08-11 | 6.60 (71) |
| Osananajimi to Kekkon Shitara Otsuki no Maid mo Yattekita Ken | 2012-12-28 | 6.30 (25) |
| Osananajimi to Ocha Shiyo ka | TBA | - |
| Osananajimi to Watashi to Game no Hanashi | 2017-12-29 | - (2) |
| Osananajimi to Yaru Tame ni Tsuyoku Natteyaru! | 2021-12-15 | - |
| Osananajimi to no Kurashikata | 2006-09-15 | 6.70 (15) |
| Osananajimi wa 2-kai no Mado Kara Yatte Kuru | 2011-11-30 | - |
| Osananajimi wa BL Suki na Kyuuketsuki | 2014-10-26 | - |
| Osananajimi wa Daitouryou: My girlfriend is the PRESIDENT. | 2009-10-30 | 7.00 (3527) |
| Osananajimi wa Daitouryou: My girlfriend is the PRESIDENT. Fandisc | 2010-08-13 | 6.80 (878) |
| Osananajimi wa Kenshinteki! | 2016-05-29 | - |
| Osananajimi wa Kousoku Ecchi ga Suki? | 2020-12-21 | - |
| Osananajimi wa Nukenin ~Bunshin Harem & Henshin Sex~ | 2013-10-04 | 5.40 (7) |
| Osananajimi wa Shuusoku Suru | 2019-12-27 | - |
| Osananajimi wa, Kakure Do M ~Hentai Choukyou ni Sasottara Dohamari Shichatta~ | 2017-10-06 | 6.20 (19) |
| Osanasugiru Katei Kyoushi | 2016-09-30 | 5.90 (25) |
| Osanazuma Miyako | 2007-04-01 | - |
| Osanazuma ga Tsukushite Kureru no | 2018-01-26 | 6.20 (7) |
| Osawagase! Kaitou Cure Flowne | 2008-09-05 | - (1) |
| Osawari Shotakko | 2010-01-01 | - (3) |
| Osawari man in Densha | 2011-05-25 | - |
| Osa★Tsuma Onii-chan ga Danna-sama | 2007-04-20 | - (3) |
| Oscillatus Zero | 2017-08-17 | - |
| Osekkai na Imouto | 2005-12-02 | - |