| NEC PC-9801 Series 5.25in. disk |  Cal II | 1991 | Birdy Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | Cal III - Kanketsu-hen | 1991 | Birdy Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | Can Can Bunny Spirits | 1991 | Cocktail Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | Caramel Quest - Meitenkyuu no Megamizou | 1991 | Agumix Japan |
| NEC PC-9801 Series 5.25in. disk | CG Story - Fuumashi Erika | 1991 | Explorer Japan |
| NEC PC-9801 Series 5.25in. disk | Cobra Mission - Panic in Cobra City | 1991 | Inos Japan |
| NEC PC-9801 Series 5.25in. disk | Columns - Taisen Mode-tsuki | 1991 | SystemSoft Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Computer no Tamago | 1991 | Heart Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | Cosmic Psycho | 1991 | Cocktail Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | Crystal Chaser - Tenkuu no Mashoukyuu | 1991 | Telenet Japan |
| NEC PC-9801 Series 5.25in. disk | CyberBlock Metal Orange 18 | 1991 | Cybertech Custom Japan |
| NEC PC-9801 Series 5.25in. disk | D.O. Doki Doki Disk Vol.1 | 1991 | DO Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | D.P.S. SG 2 - Dream Program System SG Set 2 18 | 1991 | Alicesoft Japan |
| NEC PC-9801 Series 5.25in. disk | D.P.S. SG 3 - Dream Program System SG Set 3 18 | 1991 | Alicesoft Japan |
| NEC PC-9801 Series 5.25in. disk | Daigekichin - Nichibei Kaitei no Taiketsu | 1991 | Quota Japan |
| NEC PC-9801 Series 5.25in. disk | Daisenryaku III '90 - Kakuchou Editor Disk | 1991 | Takeru Co. Ltd Japan |
| NEC PC-9801 Series 5.25in. disk | Daisenryaku III '90 - Players Pack Vol. 1 | 1991 | ABA Japan |
| NEC PC-9801 Series 5.25in. disk | Daisenryaku III '90 - Players Pack Vol. 2 | 1991 | ABA Japan |
| NEC PC-9801 Series 5.25in. disk | Daitoua Mokushiroku - Gou | 1991 | Telenet Japan |
| NEC PC-9801 Series 5.25in. disk | Daiyuugen Model R-5165~66 | 1991 | Office Koukan Japan |
| NEC PC-9801 Series 5.25in. disk | Darwin's Dilemma - The Solution is Evolution | 1991 | Starcraft, Inc. Japan |
| NEC PC-9801 Series 5.25in. disk | Deflektor | 1991 | BPS Bullet-Proof Soft. Japan |
| NEC PC-9801 Series 5.25in. disk | Deja Vu - A Nightmare Comes True Model PS-34 | 1991 | Pack-In-Video Co., Ltd. Japan |
| NEC PC-9801 Series 5.25in. disk | Dennou Gakuen 4 - Ape Hunter J | 1991 | Gainax Japan |
| NEC PC-9801 Series 5.25in. disk | Dinosaur Model NW10021020 | 1991 | Falcom Nihon Falcom Corp. Japan |
| NEC PC-9801 Series 5.25in. disk | Disc Station 98 #02 | 1991 | Compile |
| NEC PC-9801 Series 5.25in. disk | Disc Station 98 #03 | 1991 | Compile |
| NEC PC-9801 Series 5.25in. disk | Disc Station 98 #04 | 1991 | Compile |
| NEC PC-9801 Series 5.25in. disk | Disc Station 98 #05 | 1991 | Compile |
| NEC PC-9801 Series 5.25in. disk | Disc Station 98 #06 | 1991 | Compile |
| NEC PC-9801 Series 5.25in. disk | Disc Station 98 #07 | 1991 | Compile |
| NEC PC-9801 Series 5.25in. disk | Disc Station 98 #08 | 1991 | Compile |
| NEC PC-9801 Series 5.25in. disk | Disc Station 98 Bessatu - Map & Construction | 1991 | Compile |
| NEC PC-9801 Series 5.25in. disk | Disc Station 98 EX #1 | 1991 | Compile |
| NEC PC-9801 Series 5.25in. disk | Disc Station 98 EX #2 | 1991 | Compile |
| NEC PC-9801 Series 5.25in. disk | Disc Station 98 EX #3 | 1991 | Compile |
| NEC PC-9801 Series 5.25in. disk | Disk Bishoujo Daizukan 91 | 1991 | Santa Fe Japan |
| NEC PC-9801 Series 5.25in. disk | Dragon City X Shitei | 1991 | Fairytale Japan |
| NEC PC-9801 Series 5.25in. disk | Dragon Eyes 18 | 1991 | Game Technopolis Japan |
| NEC PC-9801 Series 5.25in. disk | Dragon Knight III | 1991 | Elf Japan |
