| Othello Game | r116964 | 2026-05-18 |
| Other Age | r3851 | 2026-06-08 |
| Other Age: Second Encounter | r18976 | 2026-06-09 |
| Other Age: Second Encounter - Physical Edition | r38120 | 2026-05-21 |
| Other Age: Second Encounter v1.0 | r18975 | 2026-04-21 |
| Other Age: Second Encounter v2.0 | r38112 | 2026-06-09 |
| Other Age: Second Encounter v2.0 | r38113 | 2026-06-09 |
| Other Side | r33353 | 2026-06-08 |
| Other Side 1.0ver. episode:00 S.A.D | r114185 | 2026-06-04 |
| Other Spheres | r148148 | 2026-04-21 |
| Otherside | r94731 | 2026-06-08 |
| Otherwordly Goods Store | r137289 | 2026-05-19 |
| Otherworld Convergence | r142948 | 2026-06-05 |
| Otherworld Convergence - Special Edition | r142943 | 2026-06-05 |
| Otherworld Shadow | r146448 | 2026-05-11 |
| Otherworld Shadow | r146459 | 2026-04-21 |
| Otherworldly Amour - Demo | r104452 | 2026-05-21 |
| Oto Ane | r39043 | 2026-06-08 |
| Oto Love ~Josou Bishounen Gentei!~ | r140243 | 2026-05-28 |
| Oto-hime | r127757 | 2026-04-21 |
| Oto-san wo Ore ni Kudasai! | r147543 | 2026-05-21 |
| OtoZ | r45116 | 2026-04-21 |
| Otobe Daigaku: Taiikukai Cafe | r89818 | 2026-06-08 |
| Otoboku - Maidens Are Falling for Me! - Download Edition | r19777 | 2026-04-21 |
| Otoboku - Maidens Are Falling for Me! - Limited Edition | r25651 | 2026-05-16 |
| Otogeto! | r110451 | 2026-06-08 |
| Otogi Renwa - Chapter 1 | r111477 | 2026-06-08 |
| Otogi Renwa - Chapter 3 | r111479 | 2026-06-08 |
| Otogi Renwa - Chapter 3 | r154368 | 2026-06-08 |
| Otogi Renwa - Chapters 1-2 | r111478 | 2026-06-08 |
| Otogi Story Tenshi no Shippo | r59344 | 2026-06-08 |
| Otogi no Kuni | r56715 | 2026-06-08 |
| Otogibanashi Shokudou | r111400 | 2026-06-05 |
| Otogibanashi wa Yami no Naka - DVDPG | r30489 | 2026-06-08 |
| Otogibanashiya | r21689 | 2026-06-08 |
| Otogirisou | r1311 | 2026-05-30 |
| Otogirisou | r75182 | 2026-05-21 |
| Otogirisou | r1308 | 2026-05-12 |
| Otogirisou | r120276 | 2026-04-21 |
| Otogirisou - S! Appli Edition | r75181 | 2026-06-09 |
| Otogirisou Soseihen | r75185 | 2026-06-09 |
| Otogirisou: Hypericum Perforatum | r104513 | 2026-04-21 |
| Otohime-sama no Omuko-sama | r31253 | 2026-06-09 |
| Otokano ~Otouto no Kanojo ga Bunkei de Tsuyome!?~ | r101868 | 2026-05-27 |
| 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 | 2026-05-27 |
| Otoko Benjo ~Imouto Mitai na Otouto to Otouto Mitai na Imouto o Ijimeru Natsuyasumi~ | r61697 | 2026-06-01 |
| Otoko Dogeza | r57846 | 2026-05-16 |
| Otoko Dogeza Jigoku | r136 | 2026-05-21 |