| NEC PC-9801 Series 5.25in. disk |  In the Dungeon | 199? | Nemo Japan |
| NEC PC-9801 Series 5.25in. disk | Inindou - Datou Nobunaga with Soundware Model KN10191020 | 199? | KOEI Co., Ltd. Japan |
| NEC PC-9801 Series 5.25in. disk | Inindou - Datou Nobunaga Model KN10181020 | 1991 | KOEI Co., Ltd. Japan |
| NEC PC-9801 Series 5.25in. disk | Injuu Gakuen - La Blue Girl 18 | 1994 | Dez Climax |
| NEC PC-9801 Series 5.25in. disk | Injuu Genmu | 1993 | Ringer Bell Japan |
| NEC PC-9801 Series 5.25in. disk | Injuu Genmu II - Brain Burst!! | 1993 | Ringer Bell Japan |
| NEC PC-9801 Series 5.25in. disk | Injuu no Datenshi - Requiem for Fallen Angels | 1996 | Discovery Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Inma Seifuku Kari 18 | 1995 | AIL Japan |
| NEC PC-9801 Series 5.25in. disk | Insiders - Network no Bouken - Eve ga Inai | 1993 | ASCII Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Insiders - PC Naibu e no Tabi - Maou Halton no Wana Model NFAD14054 | 1988 | ASCII Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Inspector - Jikuu Sasatsukan Hayate | 1994 | Altacia Japan |
| NEC PC-9801 Series 5.25in. disk | Intruder - Sakura Yashiki no Tansaku 18 | 1991 | Alicesoft Japan |
| NEC PC-9801 Series 5.25in. disk | Ippatsu Jang! | 1995 | May-Be Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | Ireen | 1991 | Adult Inn Japan |
| NEC PC-9801 Series 5.25in. disk | Iris-tei Serenade 18 | 1992 | Agumix Japan |
| NEC PC-9801 Series 5.25in. disk | Iris-tei Serenade - Special na O-ma-ke | 199? | Agumix Japan |
| NEC PC-9801 Series 5.25in. disk | Irosuu Koujou Iinkai Dai 2-shuu 18 | 1994 | Arkham Products |
| NEC PC-9801 Series 5.25in. disk | Irosuu Koujou Iinkai Dai 6-shuu 18 | 1994 | Arkham Products |
| NEC PC-9801 Series 5.25in. disk | Irosuu Koujou Iinkai Dai 9-shuu | 1995 | Arkham Products |
| NEC PC-9801 Series 5.25in. disk | Isaku 18 | 1995 | Elf Japan |
| NEC PC-9801 Series 5.25in. disk | Ishido - The Way of Stones | 1990 | ASCII Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Ishin no Arashi Model NFKN14021 | 1988 | KOEI Co., Ltd. Japan |
| NEC PC-9801 Series 5.25in. disk | Itsuka Dokoka de. - Erotic Baka Novel Series 2 | 1995 | Cocktail Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | IUC Disk Kaihou #001 | 199? | IDES Japan |
| NEC PC-9801 Series 5.25in. disk | IUC Disk Kaihou #002 | 199? | IDES Japan |
| NEC PC-9801 Series 5.25in. disk | IUC Disk Kaihou #003 | 199? | IDES Japan |
| NEC PC-9801 Series 5.25in. disk | IUC Disk Kaihou #004 | 199? | IDES Japan |
| NEC PC-9801 Series 5.25in. disk | J no Higeki - Las Vegas Renzoku Satsujin Jiken | 1992 | Thinking Rabbit Japan |
| NEC PC-9801 Series 5.25in. disk | J. League Hyper Soccer - Wave no Arashi | 1993 | C2 World |
| NEC PC-9801 Series 5.25in. disk | J.B. Harold 3: D.C. Connection - Ai to Shi no Meiro | 1989 | Riverhill Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | J.B. Harold Jikenbo #1: Final Mystery - Murder Club | 1986 | Riverhill Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | J.B. Harold Series #2: Manhattan Requiem - Angels Flying in the Dark | 1987 | Riverhill Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | J.League Professional Soccer 1993 | 1993 | Victor Ent. Japan |
| NEC PC-9801 Series 5.25in. disk | Jack - Haitoku no Megami 18 | 1995 | Silky's Japan |
| NEC PC-9801 Series 5.25in. disk | Jan Jaka Jan 18 | 1992 | Elf Japan |
| NEC PC-9801 Series 5.25in. disk | Jan Oh! Quest | 1992 | Pixy Bell Japan |
| NEC PC-9801 Series 5.25in. disk | Jan-borg Suzume | 1990 | Studio Offside |
| NEC PC-9801 Series 5.25in. disk | Jangou 1 | 1987 | Cross Media Soft Japan |
| NEC PC-9801 Series 5.25in. disk | Jangou 2 - Kouchinou Ban | 1989 | Victor Musical Industries, Inc. Japan |
| NEC PC-9801 Series 5.25in. disk | Jangou 3 | 1992 | Victor Musical Industries, Inc. Japan |
