| Opona - Demo | r71681 | 2026-04-21 |
| Oppai Baka -Oppai Igai wa Mitomenai!!- | r3513 | 2026-05-11 |
| Oppai Baka ~An Idiot for TITS, In a World Full of TITS!!~ | r133880 | 2026-04-21 |
| Oppai Cafe. La mère, la fille et leur poitrines fourbes | r54317 | 2026-04-21 |
| Oppai Cafe. My mother, my sister and Me | r62586 | 2026-05-15 |
| Oppai Cafe. My mother, my sister and Me | r119124 | 2026-04-21 |
| Oppai Cafe. My mother, my sister and Me | r63134 | 2026-04-21 |
| Oppai Café ~Oyako de Cos Chichi~ | r77286 | 2026-04-21 |
| Oppai Dekai!! Nurse to Ichakora Ero×2 Nyuuin Seikatsu!? | r146820 | 2026-04-21 |
| Oppai Dekai!! Nurse to Ichakora Ero×2 Nyuuin Seikatsu!? [AI +Edited TL] | r148437 | 2026-04-21 |
| Oppai Gakuen Marching Band Bu! ~Hatsujou Hamedori Katsudou Nisshi~ | r116231 | 2026-04-21 |
| Oppai Heart ~Kanojo wa Kedamono Hatsujouki!?~ | r106262 | 2026-05-14 |
| Oppai Heart ~Kanojo wa Kedamono Hatsujouki!?~ DVDPG | r14776 | 2026-05-16 |
| Oppai Igai ga Dame Sugiru Ane | r116430 | 2026-05-16 |
| Oppai Igai ga Dame Sugiru Ane - Low Price Edition | r45800 | 2026-05-16 |
| Oppai Kaijuu Akanegon ~Katei Kyoushi wa do S Chijo~ | r116300 | 2026-04-21 |
| Oppai Kareshi - Demo | r124845 | 2026-04-21 |
| Oppai Nurse! ~Hakui no Sakunyuu Byoutou~ Download Edition | r20657 | 2026-05-10 |
| Oppai Odyssey v0.5 | r114454 | 2026-04-21 |
| Oppai Odyssey v0.5.0a | r118367 | 2026-05-16 |
| Oppai Party Creampie Quest | r144929 | 2026-04-21 |
| Oppai Samurai: Knocked up by a No Name Novice | r106901 | 2026-04-21 |
| Oppai Samurai: Knocked up by a No Name Novice | r112000 | 2026-04-21 |
| Oppai Samurai: Knocked up by a No Name Novice | r133070 | 2026-04-21 |
| Oppai Samurai: Knocked up by a No Name Novice | r112967 | 2026-04-21 |
| Oppai Tsuma Oppai ga Ippai Pack | r17646 | 2026-05-16 |
| Oppai Tsuma ~Innyuu L-Cup Himawari Ayasa~ | r152015 | 2026-05-16 |
| Oppai Tsuma ~Takabisha H-Cup Kazama Akemi~ | r15927 | 2026-05-08 |
| Oppai no Ouja 48 | r97903 | 2026-04-21 |
| Oppaidius: Desert Island! - Deluxe Edition | r71974 | 2026-04-21 |
| Oppaidius: Desert Island! - Deluxe Topless Cover Limited Edition | r71975 | 2026-04-21 |
| Oppaidius: Desert Island! - Demo | r77567 | 2026-05-12 |
| Oppaidius: Desert Island! - Download Edition | r71972 | 2026-04-21 |
| Oppaidius: Desert Island! - Physical Edition | r71973 | 2026-04-21 |
| Oppaidius: Summer Trouble! - Deluxe Edition | r54019 | 2026-04-21 |
| Oppaidius: Summer Trouble! - Demo v1.0 | r54015 | 2026-04-21 |
| Oppaidius: Summer Trouble! - Demo v1.1 | r54016 | 2026-04-21 |
| Oppaidius: Summer Trouble! - Download Edition | r54017 | 2026-04-21 |
| Oppaidius: Summer Trouble! - Physical Edition | r54018 | 2026-04-21 |
| Oppaidius: Tropical Cruise! | r66996 | 2026-04-21 |
| Oppenheim no Kojou | r81628 | 2026-05-15 |
| Opportunity: A Sugar Baby Story | r88082 | 2026-04-21 |
| Opportunity: A Sugar Baby Story - Chapter 1 | r78085 | 2026-05-15 |
| Opportunity: A Sugar Baby Story - Chapter 2 | r88080 | 2026-05-15 |
| Opportunity: A Sugar Baby Story - Chapter 3 | r88081 | 2026-05-15 |
| Opportunity: A Sugar Baby Story - Chapter 4 | r94400 | 2026-05-15 |
| Opportunity: A Sugar Baby Story - Chapter 5 | r103663 | 2026-04-21 |
| Optimal Solution | r123261 | 2026-04-21 |
| Oral Lessons With Chii-chan | r120860 | 2026-04-21 |
| Oral Lessons With Chii-chan | r61202 | 2026-04-21 |