| Ishika to Honori - First Press Special Edition | r140 | 2026-05-22 |
| Ishin Renka Ryouma Gaiden - First Press Limited Edition | r34115 | 2026-05-20 |
| Ishoku no Ori -Anna Bakemono ni Okasareru Nante Zettai ni Iya!!- DVDPG | r150061 | 2026-05-21 |
| Ishu Aigan - HD Version | r65581 | 2026-04-21 |
| Ishu Aigan - Widescreen/Windows 8.1 Support Edition | r40935 | 2026-05-16 |
| Ishu Kouhai Jikken 2 ~Suzumiya Haruhi no Shokushu~ Package Edition | r70687 | 2026-05-17 |
| Ishu Soukan - Package Edition | r36045 | 2026-05-20 |
| Isis & Irina H Story Tsuika Data - Official Mail Order Privilege | r47443 | 2026-05-17 |
| Isis: The Fall | r91760 | 2026-05-06 |
| Isis: The Fall | r144516 | 2026-04-21 |
| Iskusstvo Diplomatic i Ljubvi v0.16 | r151619 | 2026-05-17 |
| Island Date | r145452 | 2026-05-06 |
| Island Days | r150018 | 2026-05-10 |
| Island Days | r128478 | 2026-04-21 |
| Island Days | r31355 | 2026-04-21 |
| Island Diary | r82817 | 2026-04-21 |
| Island Diary | r85168 | 2026-04-21 |
| Island Diary | r120653 | 2026-04-21 |
| Island Diary - 18+ DLC | r82973 | 2026-05-16 |
| Island Diary - 18+ Edition | r52379 | 2026-04-21 |
| Island Diary - 18+ Edition (Uncensored) | r88839 | 2026-04-21 |
| Island Diary - Censored Edition | r52363 | 2026-05-19 |
| Island Diary - Trial | r78585 | 2026-05-14 |
| Island Love | r146386 | 2026-04-21 |
| Island Resort -Kettou Okihimejima Bunkou- | r35169 | 2026-05-09 |
| Island in Yellow v0.01 | r127176 | 2026-04-21 |
| Island of Rain & Rainbows | r130467 | 2026-05-19 |
| Island of the Magnolias | r73674 | 2026-05-18 |
| Isle Mystique | r32478 | 2026-05-22 |
| Isle of Enchantment | r100102 | 2026-05-06 |
| Isle of Fall v0.5 | r129556 | 2026-04-21 |
| Isle of Maligree | r110471 | 2026-04-21 |
| Isle of Maligree - Demo Version | r111766 | 2026-04-21 |
| Isle of the Vanished | r145609 | 2026-04-21 |
| Isogashi kata no tame no Zombie Police | r140122 | 2026-05-22 |
| Isogashi kata no tame no Zombie Police | r140120 | 2026-05-22 |
| Isogashii Hito no Tame no Fuujinroku Extra | r54077 | 2026-05-21 |
| Isogashii Hito no Tame no Kaeizuka ~ Full Voice Edition | r37152 | 2026-05-22 |
| Isogashii Hito no Tame no Kaeizuka ~ Full Voice Patch | r37153 | 2026-05-16 |
| Isogashii Hito no Tame no Kaeizuka ~ No Voice Edition | r37151 | 2026-05-22 |
| Isogashii Hito no Tame no Koumakyou | r6265 | 2026-05-17 |
| Isola del;tesoro versione mezzo | r114194 | 2026-04-21 |
| Isola's Spooky Soiree - An Egg Factory Game v0.2 | r101861 | 2026-04-21 |
| Isolated Pleasure [Ch. 1-4] | r98704 | 2026-04-21 |
| Isourou - Oi, Nanda Kore wa ver | r96047 | 2026-05-22 |
| Issho ni Asobou | r96573 | 2026-05-21 |
| Issho ni Chapuchapu Time! ~Ofuro de Ichaicha Seikatsu~ | r124180 | 2026-04-21 |
| Issho ni Ikimashou Ikimashou Ikimashou | r128963 | 2026-05-22 |
| Issho ni Ikimashou Ikimashou Ikimashou | r135973 | 2026-05-22 |
| Issho ni Ikimashou Ikimashou Ikimashou | r128517 | 2026-05-22 |