| Osu Mesu ☆ Time Slip! - DVD-PG | r55605 | 2026-05-16 |
| Osu-Boys!! ~Ikemen Ryoujoku ☆ Paradise~ | r73777 | 2026-05-13 |
| Osu-Boys!! ~Ikemen Ryoujoku ☆ Paradise~ | r65948 | 2026-05-11 |
| Osvobozhdenie | r99471 | 2026-05-19 |
| Ot Geroja k Zlodeju v0.4.1 | r125166 | 2026-05-17 |
| Ot vsego serdca | r63652 | 2026-05-10 |
| OtaMaid Mai | r67132 | 2026-05-16 |
| OtaMaid Mai | r67133 | 2026-04-21 |
| OtaMaid ~Kanzenban~ | r118799 | 2026-04-21 |
| Otacir no Hime ni Kokurareta Kekka wwwww - Download Edition | r40051 | 2026-05-17 |
| Otahime Ryougyaku Circle ~Yamihime no Otoko Jijou~ Trial Edition | r47247 | 2026-05-17 |
| Otakano | r97061 | 2026-05-18 |
| Otaku to Musume-san - Download Edition | r37756 | 2026-05-19 |
| Otaku's Fantasy | r54031 | 2026-04-21 |
| Otaku's Fantasy - Uncensored Patch | r54069 | 2026-05-16 |
| Otaku's Fantasy 2 | r63520 | 2026-05-16 |
| Otaku's Fantasy 2 Uncensored Patch | r67470 | 2026-04-21 |
| Otama! ~Otaku Nakama wa Chikkoi Mania~ Momiji Special Trial Edition | r22976 | 2026-05-19 |
| Otama! ~Otaku Nakama wa Chikkoi Mania~ Trial Edition | r22620 | 2026-05-10 |
| Otanuki-sama de Bakunyuu Mamire in Mesudanuki-sama ni Shuchinikurin - Free Edition | r134846 | 2026-05-17 |
| Otasarezuma ~Anata ga Soba ni Ite Kuretanara~ | r128360 | 2026-05-20 |
| Otbrosy: Part 1 (v9.0) + Part 2 (v16.0) + Part 3 (v24.1) | r102529 | 2026-05-20 |
| Otdelenie 38 - Early Access | r128176 | 2026-05-20 |
| Otec i Uchitel' | r134645 | 2026-05-10 |
| Otenbahime to Juusha to Tougijou - Download Edition | r128707 | 2026-05-17 |
| Otenbahime to Juusha to Tougijou - Package Edition | r128705 | 2026-05-16 |
| Otgoloski Obmana v0.62 | r117756 | 2026-05-19 |
| Othello Game | r116964 | 2026-05-18 |
| Other Age | r3851 | 2026-05-08 |
| Other Age: Second Encounter | r18976 | 2026-04-21 |
| Other Age: Second Encounter - Physical Edition | r38120 | 2026-04-21 |
| Other Age: Second Encounter v1.0 | r18975 | 2026-04-21 |
| Other Age: Second Encounter v2.0 | r38112 | 2026-05-16 |
| Other Age: Second Encounter v2.0 | r38113 | 2026-05-16 |
| Other Side | r33353 | 2026-04-21 |
| Other Side 1.0版 episode:00 S.A.D | r114185 | 2026-04-21 |
| Other Spheres | r148148 | 2026-04-21 |
| Otherside | r94731 | 2026-05-16 |
| Otherwordly Goods Store | r137289 | 2026-05-19 |
| Otherworld Convergence | r142948 | 2026-04-21 |
| Otherworld Convergence - Special Edition | r142943 | 2026-04-21 |
| Otherworld Shadow | r146448 | 2026-05-11 |
| Otherworld Shadow | r146459 | 2026-04-21 |
| Otherworldly Amour - Demo | r104452 | 2026-04-21 |
| Oto Love ~Josou Bishounen Gentei!~ | r140243 | 2026-04-21 |
| Oto-hime | r127757 | 2026-04-21 |
| Oto-san wo Ore ni Kudasai! | r147543 | 2026-05-11 |
| OtoZ | r45116 | 2026-04-21 |
| Otoboku - Maidens Are Falling for Me! - Download Edition | r19777 | 2026-04-21 |
| Otoboku - Maidens Are Falling for Me! - Limited Edition | r25651 | 2026-05-16 |