| Oppai Kaijuu Akanegon ~Katei Kyoushi wa do S Chijo~ Download Edition | r17836 | 2026-05-17 |
| Oppai Kareshi - Demo | r124845 | 2026-04-21 |
| Oppai Ma~jan | r121866 | 2026-05-18 |
| 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 Office ~Chou Binkan K Cup!! Houjou Shiori 28 Sai~ | r23768 | 2026-05-19 |
| Oppai Party Creampie Quest | r144929 | 2026-04-21 |
| Oppai Pururun Taizai Ki | r26121 | 2026-05-19 |
| Oppai Samurai: Knocked up by a No Name Novice | r112000 | 2026-05-20 |
| Oppai Samurai: Knocked up by a No Name Novice | r112967 | 2026-05-19 |
| Oppai Samurai: Knocked up by a No Name Novice | r106901 | 2026-04-21 |
| Oppai Samurai: Knocked up by a No Name Novice | r133070 | 2026-04-21 |
| Oppai Sensou - Kyonyuu VS Hinnyuu - DVD-PG | r31636 | 2026-05-16 |
| Oppai Tappun Ureure Body Hoken no Sense x 2 Ecchi no Nayami ni Kotaete Ageru Ippai Dashite ne ~Seieki Kajou Hen~ | r20658 | 2026-05-17 |
| 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 | 2026-05-17 |
| Oppai no Ouja 48 | r97903 | 2026-04-21 |
| Oppai o Mederu Dake | r127025 | 2026-05-18 |
| Oppaidius: Desert Island! - Deluxe Edition | r71974 | 2026-05-20 |
| 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 | 2026-05-20 |
| Oppaidius: Summer Trouble! - Download Edition | r54017 | 2026-05-20 |
| 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 | r61202 | 2026-04-21 |
| Oral Lessons With Chii-chan | r120860 | 2026-04-21 |
| Oral Lessons With Chii-chan - GOG Edition | r135732 | 2026-05-16 |
| Oral Lessons With Chii-chan ♥ | r81332 | 2026-05-20 |
| Orange Blossoms | r124811 | 2026-04-21 |
| Orange Blossoms - Demo | r107397 | 2026-04-21 |
| Orange Couch | r45103 | 2026-04-21 |
| Orange Couch | r28617 | 2026-04-21 |
| Orange Heart | r39979 | 2026-05-18 |
| Orange Honey ~Boku wa Kimi ni Koishiteru~ Regular Edition | r15782 | 2026-05-20 |
| Orange Hourglass - Chapter 3 | r81647 | 2026-05-19 |