(I made a vow not to upload Corpse Party until I could find the original Japanese PC-98 version copy of Corpse-Party PC-98, I have.)
The Original PC-98 version of corpse party is available through webarchive on enterbrain's site.
The emulator to play it is also available through enterbrain as well. (Use D2 by Mr.Nakao instead!) I've include the emulator and the game as a download:
---(Warning, Full Screen only)----
PC Download (Japanese)
Mac Download (Japanese)(Mouse only)
(you'll need to quit by selecting the last option from the save menu)
--For the playable English PC freeware remake---, please check out:
CorpseParty-Rebuilt- over on, http://www.memoriesoffear.com/ these guys are a really cool fan translation group that are translating a whole bunch of really cool japanese rpgmaker games.
(from corpseparty.wikia.com : CORPSE-PARTY (PC-98))
CORPSE-PARTY (コープスパーティー Kōpusu Pātī?) is the original survival horror adventure game in the Corpse Party series created by KENIX SOFT. It was made using the RPG Tkool Dante 98 program for the NEC PC-9801 home system, and it was released in Japan on April 22, 1996. It is usually known under the abbreviation Dante 98 (Dante98版 Dante98 Han?) in Japan and occasionally as CP98 overseas.
On December 17th, 1992, a Japanese group called ASCII released a program titled RPG Tkool Dante 98 for the Japanese exclusive home system known as NEC PC-9801 which allowed people to develop their own role-playing games. They further promoted their tool by publishing a monthly magazine titled LOGIN Sofcom where amateur developers could submit their creations. On April 22nd, 1996, an adventure game called CORPSE-PARTY was published in the Spring 1996 edition of LOGIN Sofcom No.6. It was made by a 22-year-old college student by the name of Makoto Kedouin. On February 26th, 1997, Kedouin won second place in the Second Annual ASCII ENTERTAINMENT competition, netting him 5 million yen [$61,675.00 USD].
This game was remade nine years later for the mobile under the title Corpse Party: NewChapter. This new version would later be ported to the PC as Corpse Party BloodCovered and once again to the PSP as Corpse Party: BloodCovered ...Repeated Fear.
On September 1, 2011 Corpse Party saw a sequel, titled Corpse Party: Book of Shadows for PSP and iOS which further tells the story about the Kisaragi students. Since then, Corpse Party had many spin-offs, manga adaptations, an OVA and a live-action movie.
Three years after the release of Book of Shadows, the final part to Heavenly Host saga was released, called Corpse Party: Blood Drive for PSVita.
About a year before Corpse Party: BLOOD DRIVE was released, the first chapter of a new project titled Corpse Party 2: DEAD PATIENT was released. Taking place five years after the conclusion of Heavenly Host Elementary School saga, it serves as the latest installment of the series.