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| Otoko no Ko Paradise 4 ~Love Love Chu Chu ♪ Takusan no Otoko no Ko-tachi to Anal Sex Shitari Fellatio Sasetari Onee-sama mo Fukumete Iroiro Ecchi Shichau Omnibus ADV Game!~ | 2013-04-27 | 5.70 (11) |
| Otoko no Ko Paradise 3 | 2011-06-17 | 5.60 (9) |
| Otoko no Ko Paradise 2 | 2011-02-04 | 6.00 (8) |
| Otoko no Ko Paradise | 2010-05-10 | 5.20 (9) |
| Otoko no Ko Onahole -Akari- | 2013-03-26 | 5.20 (5) |
| Otoko no Ko Love Play | 2014-11-28 | 5.70 (20) |
| Otoko no Ko Imomushi no Nyoudou Ijime | 2014-11-01 | - |
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| Otoko no Ko Datte Dekiru mon! ~Wonderful Haramase Life~ | 2012-05-11 | 6.40 (35) |
| Otoko Yonin ga Uchikiri Kaihi ni Tsuite Honki Dashite Kangaete Mita. | 2014-08-18 | - |
| Otoko Mitai Datta Osananajimi no Inu ni Natta Boku. | 2022-06-26 | 6.70 (22) |
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| Otoko Masari na Bakunyuu Kaizoku to Kimajime Shoukou o Kyochin Hitotsu de Do M na Haramase Onaho ni Suru Kaizoku Seikatsu | 2021-12-24 | 6.20 (101) |
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| Otogizoushi | 2004-12-29 | - |
| Otogirisou | 1992-03-07 | 6.40 (149) |
| Otogibanashiya | 2011-10-13 | - (4) |
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| Otogi no Ouji-sama to Yuuwaku Marriage | 2014-06-18 | 5.90 (19) |
| Otogi Renwa - Yonshou - Komochizuki ni Tooku | 2009 | - |
| Otogi Renwa - Sanshou - Asanagi to Utagoe to | 2008-04-20 | - (1) |
| Otogi Renwa - Isshou - Kazabana ni Tokeru Inochi | 2005-08-10 | - (1) |
| Otogi Ibun: Hanakakushi | 2000-12-30 | - |
| Otogeto! | 2012-01-01 | - |
| Otobe Daigaku: Taiikukai Cafe | 2016-06-05 | - |
| OtoZ | 2008-03-13 | 6.40 (20) |
| Oto-hime | 2024-09-29 | 6.60 (11) |
| Oto Love ~Josou Bishounen Gentei!~ | 2011-11-25 | 6.80 (82) |
| Oto Ane | 2014-05-18 | - (1) |
| Otherworldly Amour | - | - |
| Otherworld Shadow | TBA | - (2) |
| Otherwordly Goods Store | 2021-10-02 | - |
| Otherside | - | - |
| Other Spheres | 2026-02-01 | - |
| Other Side | 2005-12-13 | - |
| Other Side | 2013-11-29 | 4.70 (8) |
| Other Age: Second Encounter | 2010-09-16 | 5.90 (38) |
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| Othello Game | 2008-03-16 | - |
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| Otenbahime to Juusha to Tougijou | 2012-07-21 | - (4) |
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