| Olympia Soiree (demo) | r87930 | 2026-04-21 |
| Olympia Soiree - Download Edition | r69185 | 2026-05-14 |
| Olympia Soirée - Download Edition | r95963 | 2026-04-21 |
| Olympia Soirée - Package Edition | r76178 | 2026-05-13 |
| Olympus Rising | r136555 | 2026-04-21 |
| Olympus Rising: Ragnarok | r142353 | 2026-04-21 |
| OmOneko | r105243 | 2026-05-07 |
| OmOneko | r143183 | 2026-05-06 |
| Omae ga Motetaitte Iu kara Daro!! | r103860 | 2026-05-09 |
| Omae ga Motetaitte Iu kara Daro!! Okawari (1) | r97055 | 2026-05-12 |
| Omae no Kaa-chan, Ii Onna Da yo na | r79684 | 2026-04-21 |
| Omae no Kaa-chan, Ii Onna Da yo na. | r73797 | 2026-04-21 |
| Omae no Kaa-chan, Ii Onna Da yo na. | r119310 | 2026-04-21 |
| Omae no Kaa-chan, Mesu Buta Niku Benki ni Nattenzo? | r17971 | 2026-05-05 |
| Omae no Mono wa Ore no Mono ~Otto ni wa Misenai Midara na Kao o Otouto ni Sarasu Kyonyuu Wakazuma~ | r114256 | 2026-04-21 |
| Omae no Novel Game ga Kansei Shinai Riyuu - Download Edition | r147361 | 2026-05-08 |
| Omae no Pantsu wa Nani-iro da!? | r151688 | 2026-04-21 |
| Omae wa Juujin Niku Benki ~Tanezuke Mugen Loop~ | r104073 | 2026-04-21 |
| Omamori: A MP100 Fangame - Demo | r114380 | 2026-04-21 |
| Omatase! Janbaraya♪ - First Press Edition | r20593 | 2026-05-09 |
| Omega Vampire | r114829 | 2026-05-07 |
| Omega Vampire | r64217 | 2026-04-21 |
| Omega Vampire | r133439 | 2026-04-21 |
| Omega Vampire - Package Edition | r60038 | 2026-05-07 |
| 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 -Shiki no Hajimari / Mikaifuu no Hakoniha- | r2208 | 2026-05-10 |
| 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 |
| Omegaの視界～ミヨ オワレル シマイ トワ(●nd)～ | r12438 | 2026-04-21 |
| Omen Exitio: Hunger | r111976 | 2026-04-21 |
| Omen Exitio: Hunger - Demo | r111975 | 2026-04-21 |
| 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 |
| 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 |