| OTOME LEGENDS: April Fools Edition | r90047 | 2026-04-21 |
| OTOKO DOGEZA ZIDOKU - O Inferno da Genuflexão Masculina | r147458 | 2026-04-21 |
| OTL（オフィストゥルーラブ） ～だめぇ、仕事中なのに…絶頂が止まらないのぉ～ 体験版 | r20666 | 2026-04-21 |
| OTL（オフィストゥルーラブ） ～だめぇ、仕事中なのに…絶頂が止まらないのぉ～ | r20644 | 2026-04-21 |
| OTL (Office True Love) ~Damee, Shigoto Chuu na no ni... Zecchou ga Tomaranai noo~ Windows 10 Support Edition | r75320 | 2026-05-15 |
| OTHER SIDE EPISODE:00 S.A.D | r50330 | 2026-04-21 |
| OTChi Kocchi Demo | r44951 | 2026-04-21 |
| OTChi Kocchi - Demo | r44949 | 2026-04-21 |
| OTChi Kocchi | r28756 | 2026-05-06 |
| OTChi Kocchi | r44950 | 2026-04-21 |
| OTAKU 30 | r115079 | 2026-05-06 |
| ORVEL - Demo | r146697 | 2026-05-05 |
| ORPHAN DRUG | r6998 | 2026-04-21 |
| ORIN GAMBLE | r152365 | 2026-05-11 |
| ORCA_HOTEL | r147478 | 2026-05-12 |
| ORBIT 5 - Demo | r145526 | 2026-04-21 |
| ORBIT 5 - Demo | r145528 | 2026-04-21 |
| ORBIT 5 | r145527 | 2026-05-11 |
| ORATORIO～海より青い夏の彼方で～ | r12267 | 2026-04-21 |
| ORANGE PEEL | r88848 | 2026-05-12 |
| OPUS: Longmai Changge -Zuizhong Ban- | r108973 | 2026-05-13 |
| OPUS: Longmai Changge -Zuizhong Ban- | r92997 | 2026-05-12 |
| OPUS: Longmai Changge -Zuizhong Ban- | r154313 | 2026-05-12 |
| OPUS: Echo of Starsong - Full Bloom Edition [Collector's Edition] | r115485 | 2026-05-12 |
| OPUS: Echo of Starsong - Full Bloom Edition | r92950 | 2026-05-13 |
| OPUS: Echo of Starsong | r92949 | 2026-05-12 |
| OPPAIライフ おはようからおやすみまで揉み吸い生活 DVDPG | r143930 | 2026-04-21 |
| OPPAI Succubus Academy Sucky and Busty, Demonic and Lusty! Special Mosaic Removal DLC | r124524 | 2026-05-13 |
| OPPAI Succubus Academy Sucky and Busty, Demonic and Lusty! - Prologue v0.1 | r129378 | 2026-05-12 |
| OPPAI Life - Ohayou kara Oyasumi made Momisui Seikatsu - Package Edition | r12946 | 2026-05-13 |
| OPPAI Life - Ohayou kara Oyasumi made Momisui Seikatsu - Download Edition | r21809 | 2026-05-12 |
| OPPAI Ero App Academy: Bigger, Better, Electric Boobaloo | r117402 | 2026-05-13 |
| OPPAI Ero App Academy Bigger, Better, Electric Boobaloo! | r114811 | 2026-05-13 |
| OPPAI Academy: Big, Bouncy, Booby Babes! 18+ Patch | r79527 | 2026-04-21 |
| OPPAI Academy: Big, Bouncy, Booby Babes! | r114737 | 2026-04-21 |
| OPHELIA | r75462 | 2026-05-13 |
| OPERATION: GET BICHES! | r104141 | 2026-05-07 |
| OP9: The Cold War Visual Novel | r68860 | 2026-05-12 |
| ONYX ~separate dream~ | r101198 | 2026-05-06 |
| ONLY YOU 2 - Package Edition | r9389 | 2026-05-12 |
| ONLY YOU 2 - Download Edition | r9390 | 2026-04-21 |
| ONLY YOU - Package Edition | r9387 | 2026-04-21 |
| ONLY YOU - Download Edition | r9388 | 2026-05-12 |
| ONIONION - Demo | r131572 | 2026-05-13 |
| ONF ~Tatakau Rasetsu e~ | r73119 | 2026-05-11 |
| ONE～輝く季節へ～ Vista動作確認版 | r132 | 2026-04-21 |
| ONE～輝く季節へ～ VISTA動作確認版 ダウンロード版 | r6979 | 2026-04-21 |
| ONE☆BOKU Faraway so close！～お姉ちゃんとボク～ DL版 | r71814 | 2026-04-21 |
| ONEROOM - Development Version | r105856 | 2026-05-12 |
| ONE.体験版 | r114844 | 2026-04-21 |