| Omega no Shikai | r78600 | 2026-05-12 |
| Omega no Shikai | r145180 | 2026-05-11 |
| Omega no Shikai -Aki Kaketa Shiki no Ai: Zan- | r78598 | 2026-05-12 |
| Omega no Shikai -Miyo Owareru Shimai Towa(●nd)- | r12438 | 2026-05-19 |
| Omega no Shikai -Shiki no Hajimari / Mikaifuu no Hakoniha- | r2208 | 2026-05-10 |
| Omegane Teacher -Valentine Plan- | r13579 | 2026-05-16 |
| Omegaverse IRL?! | r144575 | 2026-05-11 |
| Omegaの視界 1.シキのはじまり | r78599 | 2026-04-21 |
| Omegaの視界 Light-reWrite：未解封のハコニハ | r85891 | 2026-04-21 |
| Omegaの視界 アキかけたシキのアイ | r2209 | 2026-04-21 |
| Omegaの視界（リマスター版) | r112851 | 2026-04-21 |
| Omen Exitio: Hunger | r111976 | 2026-04-21 |
| Omen Exitio: Hunger - Demo | r111975 | 2026-04-21 |
| Omerta CODE:TYCOON | r98406 | 2026-05-20 |
| Omerta～沉默的法则～ | r133442 | 2026-04-21 |
| Omertà v0.7 Rework | r127654 | 2026-04-21 |
| Omertà ~Chinmoku no Okite~ | r52001 | 2026-04-21 |
| Omertá ~Codeks molchaniya~ | r153512 | 2026-05-11 |
| Omikon! | r83219 | 2026-05-06 |
| Ominaeshi no Kage | r34029 | 2026-05-06 |
| Ominaeshi no Kage - Package Edition | r154420 | 2026-05-14 |
| Ominous blind date | r87380 | 2026-05-06 |
| Ommetaphobia - Demo | r142460 | 2026-05-09 |
| Omni Link | r53892 | 2026-04-21 |
| Omnibus Princess | r48021 | 2026-04-21 |
| Omocha no Chachacha Vol. 2: Mai & Sayuri Hen | r68809 | 2026-05-16 |
| Omocha no Chachacha Vol. 3: Noemi Hen | r68807 | 2026-05-19 |
| Omocha no Jikan | r98089 | 2026-05-19 |
| Omoi Hito o Omou Hito | r97327 | 2026-05-18 |
| Omoi Omoware Koi Koware ~ Sensei to Himitsu no Keiyaku Ren'ai | r139397 | 2026-05-17 |
| Omoi no Hahen - Omoi no Kakera - Notice Edition | r134947 | 2026-05-15 |
| Omoi no Kakera | r99877 | 2026-05-16 |
| Omoi no Kakera -Close to- | r16288 | 2026-05-15 |
| Omoi no Kakera -Close to- | r18 | 2026-05-10 |
| Omoi no Kakera -Close to- 2800 Collection | r20 | 2026-05-10 |
| Omoi o Sasageru Otome no Melody | r48891 | 2026-05-19 |
| Omoi o Sasageru Otome no Melody - Download Edition | r71079 | 2026-05-19 |
| Omoi o Sasageru Otome no Melody - Trial Edition | r50366 | 2026-05-17 |
| Omoi... | r12275 | 2026-05-07 |
| Omoibito ga Iru Musume-tachi ga Oji-san to Ecchi Shitetara dou Omou? -T* L*ve-ru!- Package Edition | r24527 | 2026-05-19 |
| Omoide Album - Download Edition | r71624 | 2026-05-20 |
| Omoide Album - First Press Limited Edition | r13350 | 2026-05-15 |
| Omoide Kakaete Ai ni Koi!! | r91770 | 2026-05-16 |
| Omoide Kakaete Ai ni Koi!! - Download Edition | r118704 | 2026-05-20 |
| Omoide ni Kawaru Kimi for Windows | r2220 | 2026-05-19 |
| Omoide ni Kawaru Kimi ~Memories Off~ | r2221 | 2026-05-19 |
| Omoide ni Kawaru Kimi ~Memories Off~ | r2218 | 2026-05-07 |
| Omoide no Kanata | r20594 | 2026-05-19 |
| Omoide no Mukougawa | r114204 | 2026-05-17 |
| Omoide no Uchuu Ryokou | r111053 | 2026-05-19 |