| OtaMaid Mai | r67132 | 2026-05-16 |
| OtaMaid Mai | r67133 | 2026-04-21 |
| OtaMaid ~Kanzenban~ | r118799 | 2026-04-21 |
| Otaku to Musume-san - Download Edition | r37756 | 2026-05-09 |
| Otaku's Fantasy | r54031 | 2026-04-21 |
| Otaku's Fantasy - Uncensored Patch | r54069 | 2026-04-21 |
| Otaku's Fantasy 2 | r63520 | 2026-04-21 |
| Otaku's Fantasy 2 Uncensored Patch | r67470 | 2026-04-21 |
| Otama! ~Otaku Nakama wa Chikkoi Mania~ Trial Edition | r22620 | 2026-05-10 |
| Otec i Uchitel' | r134645 | 2026-05-10 |
| Otenbahime to Juusha to Tougijou - Package Edition | r128705 | 2026-05-16 |
| 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 | r38113 | 2026-05-09 |
| Other Age: Second Encounter v2.0 | r38112 | 2026-04-21 |
| 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 | 2026-05-11 |
| 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 |
| Otogi Renwa - Chapter 3 | r154368 | 2026-05-16 |
| Otogibanashiya | r21689 | 2026-05-07 |
| Otogirisou | r1308 | 2026-05-12 |
| Otogirisou | r1311 | 2026-05-05 |
| Otogirisou | r120276 | 2026-04-21 |
| Otogirisou: Hypericum Perforatum | r104513 | 2026-04-21 |
| Otokano ~Otouto no Kanojo ga Bunkei de Tsuyome!?~ | r101868 | 2026-04-21 |
| Otokano ~Otouto no Kanojo ga Bunkei de Tsuyome!?~ | r143418 | 2026-04-21 |
| Otokano ~Otouto no Kanojo ga Bunkei de Tsuyome!?~ Download Edition | r88673 | 2026-05-08 |
| Otokano ~Otouto no Kanojo ga Bunkei de Tsuyome!?~ Package Edition | r87710 | 2026-05-10 |
| Otoko Dogeza | r57846 | 2026-05-16 |
| Otoko Dogeza Jigoku | r136 | 2026-05-13 |
| Otoko Dogeza Jigoku | r93201 | 2026-04-21 |
| Otoko Miko ~Ma o Shizumeru wa Uruwashiki Otome~ Package Edition | r35102 | 2026-05-09 |
| Otoko Orgy at Maid Boy Manor | r153335 | 2026-05-14 |
| Otoko Orgy at Maid Boy Manor | r124449 | 2026-05-14 |
| Otoko Orgy at Maid Boy Manor | r118727 | 2026-04-21 |