| Otome ga Irodoru Koi no Essence | 2016-03-25 | 7.10 (120) |
| Otome ga Kanaderu Koi no Aria | 2014-11-28 | 6.90 (160) |
| Otome ga Kanaderu Koi no Aria ~Kimi ni Sasageru Encore~ | 2015-06-25 | 7.00 (77) |
| Otome ga Musubu Tsukiyo no Kirameki | 2018-11-30 | 7.10 (80) |
| Otome ga Musubu Tsukiyo no Kirameki Fullmoon Days | 2019-06-28 | 7.30 (36) |
| Otome ga Tsumugu Koi no Canvas | 2012-03-30 | 7.60 (299) |
| Otome ga Tsumugu Koi no Canvas ~Futari no Gallery~ | 2012-11-22 | 7.10 (129) |
| Otome no Higeki wa Zankoku na Kiss | 2010-08-22 | 6.70 (6) |
| Otome no Jijou | 2004-02-05 | - |
| Otome no Ken to Himegoto Concerto | 2023-07-28 | 7.40 (117) |
| Otome no Kishi wa Futatabi Maiorita | 2011-05-28 | - |
| Otome no Kyouren ~Modae Ochi Yuku Junjou~ | 2019-12-20 | 5.50 (38) |
| Otome no Susume ~Hatsumoude o Issho ni~ | 2006-12-31 | - |
| Otome o Sasagu Yakata | 2022-11-11 | - (1) |
| Otome wa Boku ni Koishiteru | 2005-01-28 | 7.00 (913) |
| Otome wa Boku ni Koishiteru ~Futari no Elder~ | 2010-06-30 | 7.70 (140) |
| Otome wa Boku ni Koishiteru: Trinkle Stars | 2018-02-23 | 7.20 (64) |
| Otome wa Karen ni Koi ni Mai! | 2013-06-28 | 6.90 (26) |
| Otome x Chikan Ressha ~Bishoujo Shimai Shanai Rape~ | 2017-02-19 | 6.00 (15) |
| Otome-Series All-Star Disk 01 | 2016-03-25 | - (2) |
| Otome-Series Josou-Shujinkou Mini-Game: New Stage 2 | 2021-11-26 | - (2) |
| Otome-Series Josou-Shujinkou Mini-Game: Toki o Koeta Meguri Ai | 2022-09-30 | - (2) |
| Otome-tic Aya | 2017-05-26 | - |
| Otome?? | - | - (1) |
| Otomeru | 2017-06-17 | - (1) |
| Otometeki Koi Kakumei★Love Revo!! | 2006-01-26 | 6.50 (256) |
| Otomimi ∞ Infinity | 2011-09-22 | 7.20 (72) |
| Otona Chinpo to Mesugaki Succubus-chan | 2020-10-31 | - (1) |
| Otona no Chikan Densha Club | 2015-05-01 | 6.00 (7) |
| Otona no Hatsukoi, Hajimemasu | 2015-02-19 | 6.60 (37) |
| Otona no Hoikuen ~"Sensei Toilet!" "Sensei wa Toilet ja Arimasen!!"~ | 2017-04-21 | 6.40 (10) |
| Otona no Kamishibaiya-san Vol2 JK Wakarase Hen | 2022-01-29 | - |
| Otona no Omochaya-san | 1999-05-14 | - (1) |
| Otona no Sentaku ~Motomeau Kankei~ | 2011-11-22 | - |
| Otona wa Mou Neru Jikan | 2008-12-29 | - (2) |
| Otonari Koi Sensou! | 2014-02-28 | 6.90 (81) |
| Otonari no Bakunyuu Niizuma | 2012-04-23 | - (1) |
| Otonari no Kokujin Otto ni Dakarete Modaeru Saiai no Tsuma. Sono Hikikae ni Ajiwau Kokujinzuma no Hada. ~Rebirth~ | 2025-12-19 | 7.50 (27) |
| 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 | 7.20 (206) |
| Otonari no Tenshi-sama ni Itsunomanika Dame Ningen ni Sareteita Ken: Memorial Vacation | 2026-07-23 | - |
| Otonari wa Minna Osananajimi | 2009-01-29 | - |
| Otonari-san Oyako to Ama Ama Harem Life ~Makabe-san Chi to In'etsu Paradise~ | 2025-06-27 | 6.00 (9) |
| Otoroe Shirazu no Inran Baa-chan! ~Mago no Nikubou mo Itadakimasu♪~ | 2022-10-07 | 6.10 (15) |
| Otosareta Bishimai ~Douka Sono Ko Dake wa Tasukete Kudasai~ | 2017-04-28 | 6.90 (86) |
| Otosareta Gishi ~ Akogareteita Gishi ga Classmate no Te de Kairaku Choukyou Saserareteiku | 2023-04-28 | 6.00 (13) |
| Otosarezuma Honami ~Aishiteiru no wa Otto dake no Hazu na no ni...~ | 2018-10-26 | 6.10 (103) |
| Otose ~Toraware no Eien~ | 2001-12 | - |
| Otose! Hitozuma Megami-sama | 2006-11-24 | 6.70 (13) |
| Otose... Iyagaru Ano Ko o Biyaku de Otose! | 2007-08-10 | - (3) |
| Otoshi Ana | 2010-03-12 | 6.00 (10) |