| Origin | r137973 | 2026-05-15 |
| Origin Story S1 + S2 v0.9.3 | r125918 | 2026-04-21 |
| Origin Story v0.6.0 | r125156 | 2026-04-21 |
| Orikyara Daishuugou! Schokolade Gakuen | r105828 | 2026-05-09 |
| Orion Demo | r36704 | 2026-04-21 |
| Orion Heart | r21629 | 2026-04-21 |
| Orion Heart～受尽凌辱的泳装战士～ | r60554 | 2026-04-21 |
| Orion the Oracle | r147621 | 2026-04-21 |
| Orion v1.0 | r91422 | 2026-04-21 |
| Orion: A Sci-Fi Visual Novel | r36705 | 2026-04-21 |
| Orion: A Sci-Fi Visual Novel Demo | r45990 | 2026-04-21 |
| Ormanin Derinliklerinde | r91403 | 2026-04-21 |
| Orphan and the Lost Mother - Demo | r88889 | 2026-04-21 |
| Orpheus | r35806 | 2026-04-21 |
| Orthros 3rd Title | r146638 | 2026-05-06 |
| Orveia v0.11 | r90027 | 2026-04-21 |
| Orwell | r76611 | 2026-05-15 |
| Orwell | r72345 | 2026-04-21 |
| Orwell - Demo | r76609 | 2026-04-21 |
| Orwell: Episode Five - Under the Spreading Chestnut Tree | r76608 | 2026-04-21 |
| Orwell: Episode Four - Memory Hole | r76607 | 2026-04-21 |
| Orwell: Episode One - The Clocks were Striking Thirteen | r72344 | 2026-04-21 |
| Orwell: Episode Three - Unperson | r76606 | 2026-05-07 |
| Orwell: Episode Two - A Place where there is No Darkness | r76605 | 2026-05-14 |
| Orwell: Ignorance is Strength | r104717 | 2026-04-21 |
| Orwell: Ignorance is Strength | r147293 | 2026-04-21 |
| Orwell: Keeping an Eye On You | r72418 | 2026-05-13 |
| Orwell: Keeping an Eye On You | r72360 | 2026-05-13 |
| Orwell: Keeping an Eye On You | r72346 | 2026-04-21 |
| Orwell: Keeping an Eye On You | r147294 | 2026-04-21 |
| Osaka Awaking | r124189 | 2026-04-21 |
| Osaka Awaking - DVDPG | r153569 | 2026-05-11 |
| Osaka Awaking - Package Edition | r48304 | 2026-05-07 |
| Osaka Awaking - Popular Edition | r62518 | 2026-05-07 |
| Osanahime | r140495 | 2026-05-07 |
| Osanai Imouto no Sei Nikki ~Anna to Ichigo~ | r153226 | 2026-05-11 |
| Osanai Imouto no Sei Nikki ~Anna to Ichigo~ Package Edition | r153227 | 2026-05-11 |
| Osanai Imouto no Sei Nikki ~Natsumi to Haruna~ Package Edition | r153210 | 2026-05-15 |
| Osanai Lemon to Otona no Vanilla | r154184 | 2026-04-28 |
| Osananajimi | r31387 | 2026-05-16 |
| Osananajimi | r23297 | 2026-05-14 |
| Osananajimi | r72955 | 2026-05-14 |
| Osananajimi - Download Edition | r27632 | 2026-05-11 |
| Osananajimi 2 | r68741 | 2026-05-06 |
| Osananajimi Ojou-sama to H de Himitsu na Dousei Seikatsu - Trial Edition | r128556 | 2026-05-11 |
| Osananajimi na Miko-san to ~Saiji ni Koi ni... Shokushu!? Made~ | r13141 | 2026-05-14 |
| Osananajimi no Iru Kurashi | r149704 | 2026-04-21 |
| Osananajimi no Yaoya no Musume ga, Eros na Taikai ni Shutsujou Shimasu. | r53093 | 2026-05-11 |
| Osananajimi to Juu Nen, Natsu | r25663 | 2026-05-06 |
| Osananajimi to no Kurashikata - Download edition | r30696 | 2026-05-08 |