| Orion: A Sci-Fi Visual Novel | r36705 | 2026-06-02 |
| Orion: A Sci-Fi Visual Novel Demo | r45990 | 2026-04-21 |
| Oriunten wo Gekitai Suru Tatta Hitotsu no Houhou | r149166 | 2026-06-03 |
| Ormanin Derinliklerinde | r91403 | 2026-05-23 |
| Ornithogalum no Hakoniwa - Trial Edition | r107327 | 2026-06-03 |
| Orphan and the Lost Mother - Demo | r88889 | 2026-04-21 |
| Orpheus | r35806 | 2026-04-21 |
| Orthros 3rd Title | r146638 | 2026-05-06 |
| Orugooru no Taiyou | r101507 | 2026-06-03 |
| Orukojin | r63968 | 2026-06-03 |
| Orveia v0.11 | r90027 | 2026-05-19 |
| Orwell | r72345 | 2026-06-03 |
| Orwell | r76611 | 2026-05-15 |
| Orwell - Demo | r76609 | 2026-04-21 |
| Orwell: Episode Five - Under the Spreading Chestnut Tree | r76608 | 2026-04-21 |
| Orwell: Episode Four - Memory Hole | r76607 | 2026-06-06 |
| Orwell: Episode One - The Clocks were Striking Thirteen | r72344 | 2026-06-02 |
| Orwell: Episode Three - Unperson | r76606 | 2026-06-06 |
| Orwell: Episode Two - A Place where there is No Darkness | r76605 | 2026-05-14 |
| Orwell: Ignorance is Strength | r104717 | 2026-06-02 |
| 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 | 2026-05-26 |
| Osaka Awaking - DVDPG | r153569 | 2026-05-25 |
| Osaka Awaking - Download Edition | r62517 | 2026-06-05 |
| Osaka Awaking - Package Edition | r48304 | 2026-06-03 |
| Osaka Awaking - Popular Edition | r62518 | 2026-06-06 |
| Osaka CRISIS ~COMEBACK＆COMES A NEW HEROINE~ DVDPG | r32727 | 2026-06-11 |
| Osaka Crisis ~Comeback & Comes a New Heroine~ Download Edition | r16194 | 2026-06-11 |
| Osaka Gitai Yu - Download Edition | r145648 | 2026-06-06 |
| Osaka Gitai Yu - Package Edition | r145650 | 2026-05-22 |
| Osaka Kowloonjo - Download Edition | r145652 | 2026-06-11 |
| Osaka Kowloonjo - Package Edition | r145653 | 2026-06-03 |
| Osaka Teikoku Danshi. ~Hanwasen wa Tomatte mo Koi wa Nonstop!~ | r86864 | 2026-06-02 |
| Osaka Teikoku Eiyuu-tachi. ~Yodogawa Yori mo Nagaku Kimi o Aisu~ | r101069 | 2026-06-06 |
| Osakoi ~Ore to Futari no Ama Ama Gohoushi H Seikatsu~ Package Edition | r44084 | 2026-05-21 |
| Osakon ~Osananajimi to Icha Love Kekkon Katsudou~ DVDPG | r28095 | 2026-06-03 |
| 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 | 2026-05-21 |
| Osananajimi | r31387 | 2026-06-03 |
| Osananajimi | r23297 | 2026-06-03 |
| Osananajimi | r72955 | 2026-06-03 |
| Osananajimi - Download Edition | r67089 | 2026-06-11 |
| Osananajimi - Download Edition | r27632 | 2026-05-11 |