| Onii-chan, Watashi Mitai na Manaita Hinnyuu no Imouto ni Ashikoki Sarete Kanjichaun Da. Hentai Da ne. Dohentai★ | r130448 | 2026-04-21 |
| Onii-chan, Watashi Mitai na Manaita Hinnyuu no Imouto ni Ashikoki Sarete Kanjichaun Da. Hentai Da ne. Dohentai★ - Download Edition | r26264 | 2026-05-18 |
| Oniichan Continue! - Download Edition | r140645 | 2026-05-17 |
| Oniichan Continue! Limited Edition | r131614 | 2026-05-18 |
| Oniichan Continue! Yuuri to Plus Make Love - Download Edition | r145897 | 2026-05-17 |
| Onii♥️Kiss: Onii-chan, Where's My Kiss? | r66482 | 2026-05-06 |
| Onii♥️Kiss: Onii-chan, Where's My Kiss? (Deepl) | r121193 | 2026-04-21 |
| Onii♥️Kiss: Onii-chan, Where's My Kiss? - 18+ Patch | r66483 | 2026-05-05 |
| Onii♥️Kiss: Onii-chan, Where's My Kiss? - Censored Edition | r60372 | 2026-05-16 |
| Onii♥️Kiss: Onii-chan, Where's My Kiss? - Mosaics Restoration Patch | r66481 | 2026-05-09 |
| Onii♥️Kiss: Onii-chan, Where's My Kiss? - Third Person Speech Patch | r66501 | 2026-05-16 |
| Onikakushi Hen | r253 | 2026-05-19 |
| Onikakushida yo! Dokuro-chan | r115497 | 2026-05-19 |
| Onikiri-den | r17015 | 2026-05-19 |
| Onikirimaru ~Kochou Ranbu Taimain Den~ Download Edition | r17261 | 2026-05-17 |
| Onirio | r148420 | 2026-04-21 |
| Onitama | r20628 | 2026-05-06 |
| Onitama - Reprint Edition | r20629 | 2026-05-16 |
| Onitsubaki 2 ~the end of the love~ | r120587 | 2026-05-11 |
| Oniyome: Oni Musume o Yome ni Moratte Nakadashi Haramase Kozukuri - Regular Edition | r55959 | 2026-05-16 |
| Online @ The Perfect Time - Demo | r112279 | 2026-04-21 |
| Online Friends - Demo | r106917 | 2026-05-19 |
| Online Love - Demo | r58523 | 2026-04-21 |
| Online Obsession | r132299 | 2026-04-21 |
| Online Obsession - Demo | r132298 | 2026-04-21 |
| Only Dance! | r148696 | 2026-05-19 |
| Only Dance! | r136622 | 2026-04-21 |
| Only Girl in High School | r79908 | 2026-05-16 |
| Only I Have Skills - Volume 1 | r89412 | 2026-05-16 |
| Only If... | r69412 | 2026-05-19 |
| Only One | r33571 | 2026-05-16 |
| Only One | r28552 | 2026-04-21 |
| Only One 2 ~Naomi Ai no Inori ga Todoku Toki~ | r20630 | 2026-05-08 |
| Only One 2.2 | r41249 | 2026-04-21 |
| Only One x Anime - DVDPG Low Price Edition | r13436 | 2026-05-10 |
| Only One ~Hikari to Haruka no Dai Undoukai~ | r13248 | 2026-05-09 |
| Only When You Sleep | r126479 | 2026-04-21 |
| Only You - Re-Cross - | r113266 | 2026-04-21 |
| Only You - Sekai no Namida to Shojo no Hanashi - Trial Edition | r147595 | 2026-05-10 |
| Only You -Re Cross- | r3925 | 2026-05-07 |
| Only You -Seikimatsu no Juliette-tachi- | r42451 | 2026-05-12 |
| Only You -Seikimatsu no Juliette-tachi- | r3931 | 2026-05-12 |
| Only You -Seikimatsu no Juliette-tachi- Demo Edition | r57142 | 2026-05-12 |
| Only You -世界の涙と少女のハナシ- Trial Edition version：share | r147597 | 2026-04-21 |
| Only You Liber Cross | r11435 | 2026-05-20 |
| Only You Liber Cross - Best Hit Selection | r11437 | 2026-05-17 |
| Only You and Me | r138035 | 2026-04-21 |
| Only in Passing | r112103 | 2026-05-19 |
| Only the Holly | r140666 | 2026-04-21 |
| Only the Roots Remain | r103369 | 2026-04-21 |