| 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 |
| Omoikkiri! Seieki Tairyou Chuunyuu! ~Takabisha Onna o Aherasero!~ DVDPG | r70083 | 2026-05-19 |
| Omokage Matsuro Dai Ichi Wa Tobichiru - Trial Edition | r18634 | 2026-05-08 |
| Omonoyaki Story | r59773 | 2026-04-21 |
| Omurice Next Time | r115103 | 2026-05-06 |
| Omurice Next Time - Demo | r115104 | 2026-05-05 |
| On Affliction and Affection | r73646 | 2026-05-06 |
| On Air Island: Survival Live Show | r114730 | 2026-05-20 |
| On Air! | r125278 | 2026-05-16 |
| On Call | r115584 | 2026-05-05 |
| On Distant Shores | r93423 | 2026-05-05 |
| On Distant Shores v0.9 | r112687 | 2026-04-21 |
| On Earth As It Is In Heaven - A Kinetic Novel | r54647 | 2026-04-21 |